the high frequency generator of a control circuit board 8 is composed of a capacitance connecting three point type oscillator , an inductance connecting three point type oscillator , or a transformer - type oscillating circuit , which has the frequency of 35 khz to 3 . 3 mhz . the circuit includes a automatic frequency fine - adjusting circuit resonating with a piezoelectric element 20 . a nicotine solution storage container 13 is made of silicon rubber , alternatively , other polymers that can be protected against the penetration of nicotine can be used . a one - way valve for liquid injection 12 is sealed by a ball or cone member under the pressure of a spring . an airflow sensor 18 can be comprised of an array of integrated thermal sensitive resistors in the shape of film . the electrode of a resistance or capacitance sensor 19 , which is sensitive to touches of human body , is composed of an upper metal film and a lower metal film and located at the end of the cigarette holder . the changes of the resistance or capacitance parameters due to human touch are inputted into the control circuit to perform the operation of a body sensitive switch . the electric controlled pump 11 , driven by a motor or a linear motor , drives a retarder that has a large speed ratio , via a shaft coupling , to revolve at a low speed but with large torque . the pump can be a peristaltic pump , a plunger pump , an eccentric pump or a screw pump . alternatively , the liquid pump can use piezoelectric pump , a super magnetostrictive pump , a thermal expansion drive pump , a thermal contraction drive pump , a thermal bubble pump . the electric control pump or valve may be thermal contractible . the valve is formed on a silicon rubber tube by nickel - titanium memory alloy or copper - based memory alloy under the force of electro - thermal contractions . the electro - thermal vaporization nozzle 17 is made of high - temperature resistant materials with low thermal conductivity . the nozzle 17 is a tubule , with the internal diameter of 0 . 05 - 2mm and the effective working length of 3 - 20 mm . an electric heating element is provided within the nozzle , and the shapes of the electric heating element and the cavity of the nozzle are designed to facilitate vaporization and ejection of liquid . the vaporization nozzle 17 may be made of conventional ceramics , or be made of aluminum silicate ceramics , titanium oxide , zirconium dioxide , yttrium oxide ceramics , molten silicon , silicon dioxide , molten aluminum oxide . the vaporization nozzle 17 may be in the shape of straight tube or spiral , and may also be made from polytetrafluoethylene , carbon fiber , glass fiber or other materials with similar properties . the electric heating element arranged within the vaporization nozzle 17 may be made of wires of nickel chromium alloy , iron chromium aluminum alloy , stainless steel , gold , platinum , tungsten molybdenum alloy , etc ., and may be in the shape of straight line , single spiral , double spiral , cluster or spiral cluster , wherein the straight line and cluster are preferred . the heating function of the electric heating element may be achieved by applying a heating coating on the inner wall of the tube , and the coating may be made from electro - thermal ceramic materials , semiconductor materials , corrosion - resistant metal films , such as gold , nickel , chromium , platinum and molybdenum . the method for coating can include a coat sintering process , a chemical deposition sintering process and an ion spraying process . the materials mentioned above can be provided within the inner wall of vaporization nozzle in any of the processes mentioned above . the nozzle with high resistance , made of metal , can have no electric heating element being attached , and can be directly applied with heating current . alternatively , the materials mentioned above can be arranged outside of the nozzle in any of the ways mentioned above , and an appropriate response time can also be achieved in the power supply mode of short - term preheating . nicotine solution used in the atomization process comprises nicotine , propylene glycol , glycerol , organic acids , anti - oxidation agents , essence , water and alcohol , in which the nicotine content is 0 . 1 %- 6 %, propylene glycol content 80 %- 90 %, organic acids 0 . 2 %- 20 %, the rest is glycerol , essence , anti - oxidation agents , water and alcohol . the structural diagram of the device shown in fig1 when a smoker puts the cigarette holder on his / her mouth , the resistance sensor 19 activates the control circuit board 8 . the control circuit board 8 then outputs two driving voltages respectively , one used to supply power to the electric heating element of the vaporization nozzle 17 and the other used to activate the micro pump 11 ( shown in fig6 ). the stored solution is then pumped to the nozzle 17 by the solution storage container 13 . on the electric heating element of the nozzle 17 , the nicotine solution is then vaporized into high temperature vapor which is subsequently ejected from the opening end . in the air , the vapor ejected out is then expanded and condensed into micro aerosol droplets . the effect of the ultrasonic piezoelectric element 20 mounting on the nozzle is that , firstly , the large liquid droplets in the unstable thermal airflow under high pressure will be in sufficient contact with the electric heating element , and thereby be vaporized . secondly , the liquid droplets in the nozzle 17 are directly fragmented and atomized . thirdly , possible bumping when the liquid is above a boiling point will be avoided . the effect of integrated atomization will allow aerosol droplets with diameters of 0 . 2 - 3 um to enter into the alveolus easily and be absorbed . the airflow sensor 18 is sensitive to the diluted air which enters through air inlet 16 when a “ suction ” action take places . the sensed signals are transmitted to the control circuit , and the control circuit then stop to supply power to the micro pump and the electric heater after a certain time delay . the relay relationship between the time delays of the micro pump and electric heater is as follows : after the electric heater is activated , the micro pump is activated after a time delay of 0 . 1 - 0 . 5 seconds ; the electric heater is then turned off after a time delay of 0 . 2 - 0 . 5 seconds when the control circuit of the micro pump is turned off , so as to guarantee a complete vaporization of the liquid after quantitative liquid injection without any leftovers . the nicotine solution container may be designed to be different sizes as required . the nicotine solution may be refilled once a day , or once a couple of days . the liquid crystal display screen 10 can show operating state parameters , such as cell capacity , smoking times per day , average using cycle and warnings for over smoking . a red led 3 blinks for each smoking action , and a sawtooth wave signal that lasts for 1 . 2 seconds is given by the control circuit for blinking signals , which provides a gradual change of luminance to imitate the ignition and combustion process of a conventional cigarette . the charger 1 , charging jack 2 , spring 4 , shell 6 , threads 7 , switch 9 , passage tube 14 and baffle plate 15 are shown in fig1 . the silicon gel tube 601 , pinch roller 602 , worm 603 and motor 604 are shown in fig6 . the control circuit and the ultrasonic micro pump may be integrated on one single chip by using a micro electronic mechanical system ( mems ). fig7 is a structural diagram of the simplified device in which the ultrasonic atomization high frequency generator and the piezoelectric ceramic element 20 are omitted . to achieve a desirable atomization effect , tiny heating wires are used in combination with the nozzle ( see fig3 ), so that the maximum diameters of one or more vaporization cavities formed between the heating wire and the inner wall of the nozzle range from 0 . 02 mm to 0 . 6 mm . the function of the airflow sensor 18 omitted is replaced by the manner that the initial signal of the resistance or capacitance sensor 119 is delayed a certain time via the control circuit and acts as the ending signal . the electronic cigarette is configured as follows : the vaporization nozzle 117 , the thermal drive pump 111 ( see fig5 ) made of nickel titanium memory alloy wire , and the liquid storage container 113 connected to the thermal drive pump constitute a liquid transmission system . two outputs of the control circuit board 108 are respectively connected to the electric heater and the pump or valve . a body sensitive resistance sensor 119 is connected to the input of the control circuit . the cell 105 and red led 103 are provided in the front end within the shell , and resemble a cigarette holder , a pipe or a pen . the thermal drive pump is an electro - thermal shrinkable peristaltic pump , made of wires of nickel titanium memory alloy or copper based alloy , with gel tube which is pressed at three points respectively during the process of electro - thermal contraction to form a pressure cavity for pumping out liquid . the change of volume of the cavity within the thermal drive pump determines the quantity of the solution to be atomized each time . upon contacting with user &# 39 ; s mouth , the resistance sensor 119 activates the control circuit 108 , the control circuit 108 then provides operating current to the thermal drive pump and the electric heater , and the output of the control circuit is turned off after the delay of 2 seconds for reactivation at the next smoking action . alternatively , a thermal expansion drive pump or a thermal bubble pump is also applicable . the thermal expansion drive pump forms a pressure cavity for pumping out liquid by allowing a micro hydrogen container with an embedded electric heating element to block the liquid inlet and open the liquid outlet at the time of thermal expansion . the charging jack 102 , led 103 , cell 105 , switch 109 , liquid - refilling valve 112 and air hole 116 are shown in fig7 . the electrode lead wire 401 , heating wire 402 , thread 403 , base 404 and nozzle 405 are shown in fig3 . the support 501 , extension spring 502 , pumping - out pressure plate 503 , silicon gel tube 504 , stop pressure plate 505 , supporting spring 506 , memory alloy wire 507 , electrode a 508 , electrode b 509 and electrode 510 are shown in fig5 . fig8 is a structural diagram of the electronic cigarette . the electro - thermal vaporization nozzle 217 of the device is connected to the liquid storage container 213 via a pneumatic valve 220 . the super elastic member 210 is connected to the pressure plate 211 which is connected to the liquid storage container 213 . the pneumatic valve is composed of a pneumatic film 214 , a magnetic steel ring 218 , a steel valve needle 220 and a reset spring 221 . the super elastic member 210 , which is made of ni - ti memory alloy , is used to apply a constant pressure on the liquid storage container via the pressure plate 211 . when the pneumatic valve opens , the liquid with nicotine enters the vaporization nozzle from the liquid storage container via the pneumatic valve and is vaporized and condensed subsequently to form a puff of smoke at high temperature . upon contacting with user &# 39 ; s mouth , the resistance sensor activates the control circuit to supply power to the electric heater . when the user performs suction action , the nd - fe - b permanent magnetic alloy ring attracts the valve needle to move in response to the pneumatic film being subjected to negative pressure . liquid is supplied when the valve needle opens , and after the pneumatic valve is reset , power supply to the electric heater is turned off after the delay of 0 . 5 seconds by the control circuit . the led 203 , charging jack 202 , cell 205 , control circuit 208 , switch 209 , refilling valve 212 , baffle plate 215 , air hole 216 and resistance sensor 219 are shown in fig8 in the device ( see fig9 ), the electro - thermal vaporization nozzle 317 , the electronic valve 311 connected with the metering cavity 320 , and the liquid storage container 313 form a liquid transmission passage . a gas vessel filled with high - pressure nitrogen is arranged around the periphery of the liquid storage container to exert pressure thereon to facilitate the transmission of the liquid . when a control signal is applied to the electronic valve , the electronic valve is activated , and the solution with nicotine enters the metering cavity from the liquid storage container under pressure . the solution pushes a piston so as to allow a constant volume of liquid at the other side of the piston to enter the vaporization nozzle via the electronic valve . the metering cavity provided at the valve is a cylinder having a liquid inlet and a liquid outlet . located within the cylinder are the piston micro holes and the reset spring connected onto the piston . the control circuit which is activated by the resistance sensor 319 controls the states of the electronic valve and the electric heater respectively . due to slow infiltration of the micro hole of the piston in the metering cavity and the force of the reset spring , the piston returns to its original position within 5 - 8 seconds after each atomization process . the cell 305 , pressure vessel 321 , pressure chamber 322 , seal threaded - opening 323 , control circuit board 308 and air hole 316 are showed in fig9 . the silicon gel tube 406 , pressure - stopping plate 407 , memory alloy wires 408 , support 409 , electrode lead wire 410 and pressure spring 411 are shown in fig4 . the inlet 701 , piston 702 , micro hole of the piston 703 , metering cavity 704 , reset spring 705 and outlet 706 are shown in fig1 . 1 . 6 % nicotine , 85 % propylene glycol , 2 % glycerol , 2 % essence , 1 % organic acid and 1 % anti - oxidation agent ; 2 . 4 % nicotine , 80 % propylene glycol , 5 % glycerol , 1 % butyl valerate , 1 % isopentyl hexonate , 0 . 6 % lauryl laurate , 0 . 4 % benzyl benzoate , 0 . 5 % methyl octynicate , 0 . 2 % ethyl heptylate , 0 . 3 % hexyl hexanoate , 2 % geranyl butyrate , 0 . 5 % menthol , 0 . 5 % citric acid and 4 % tobacco essence ; 3 . 2 % nicotine , 90 % propylene glycol , 2 . 5 % citric acid , 1 % essence and 4 . 5 % tobacco essence ; 4 . 0 . 1 % nicotine , 80 % propylene glycol , 5 % glycerol , 8 % alcohol , 2 . 9 % water , 1 % essence , 1 % tobacco essence and 2 % organic acid .