The article assesses the functional and morphological changes in the respiratory system under chronic exposure to polychlorinated hydrocarbons.

An analysis of the probability of an increase in the degree of nicotine dependence from continuous smok ing duration has been made. Nicorette has been proposed as a therapy for nicotine addiction. It has been found that the formation of nicotine dependence occurs along with an increase in the continuous smoking duration, and the adherence to smoking is higher in patients with low degrees of nicotine addiction in young age groups.