In DSM, nicotine dependence is included under the general definition of substance dependence.  The essential feature of Substance Dependence is a cluster of cognitive, behavioral, and physiologic symptoms indicating that the individual continues use of the substance despite significant substance-related problems.
The Best Materials to Cover your Greenhouse. 1  Glass: The traditional greenhouse covering, glass is the preferred material for permanence. 2  Film Plastic: Film plastic is one sixth to one tenth of the cost per square foot of a glass covered structure.
It is therefore a good idea to keep your greenhouse at a temperature that prevents dew formation. To test humidity, you can use a psychrometer, or you can just use your own experience to learn which temperatures reduce moisture buildup in your greenhouse. Then use a heater to heat to the appropriate temperature.