Health Sciences 1001A/B Lecture Notes - Lecture 20: Coronary Artery Disease, Sidestream Smoke, Passive Smoking
Smoking is the most preventable cause of disease and premature death in canada. Every cigarette a person smokes reduces life expectancy by ~11 minutes. More than 37,000 people die prematurely each year in canada due to tobacco use. Tobacco use is widespread in our society. An addiction involving physical dependence on the psychoactive drug nicotine. Nicotine -> a poisonous, addictive substance found in tobacco and responsible for many of the effects of tobacco . Addicted users must keep a steady amount of nicotine in the blood and going to the brain. If that amount , they experience withdrawal symptoms. Nicotine addiction can start within a few days of smoking and after just a few cigarettes: highly addictive. Negative effects on nearly every organ of body and overall health. Related to more than two dozen diseases and conditions o. Contain > 4000 chemicals, 40-50 of which are carcinogens or co- carcinogens and/or irritate the tissues of the respiratory system.