Fluorescent lamps also flicker as they are turned on because it takes a few moments for the gasses to heat up sufficiently to produce light. LED lights do flicker, but not in the same way, and as a matter of fact, they flicker at such a fast rate of speed that it is usually imperceptible to the human eye. Non-Rectified Flickering LED Lights. It is a fact that all LED lights naturally flicker at a rate of approximately 60 Hz per second.
Risks from smoking, as they relate to lung disease, include the following: Chronic obstructive pulmonary disease (COPD) which includes: Chronic bronchitis. Chronic bronchitis, a long-term inflammation of the bronchi (large airways), is characterized by coughing mucus over a long period. Emphysema.
Common viral respiratory diseases are illnesses caused by a variety of viruses that have similar traits and affect the upper respiratory tract. The viruses involved may be the influenza viruses, respiratory syncytial virus (RSV), parainfluenza viruses, or respiratory adenoviruses.ome of the viruses can cause more severe illness or more commonly affect certain age groups. RSV is the most common cause of respiratory tract illness in children under 2 years of age; it is the major cause of bronchiolitis, pneumonia, croup, bronchitis, and otitis media.