The American Lung Association can help with programs for smokers and for their families and friends. Smokers often find they need a second cigarette, and another and another, in order to get the same feelings.
Cigarette smoke contains thousands of substances.
One of the most important is nicotine. It is a natural part of the tobacco leaf, the only place nicotine has ever been found. Nicotine is an addictive drug. Smokers who crave it find it hard to go without having a cigarette. People who are under stress or feel nervous or bored often are at more risk of becoming addicted to nicotine.