An overdose of alcohol can cause unconsciousness, respiratory failure, and death. Alcohol is an addictive drug. The medical term for this addiction is called alcoholism. Research suggests that alcoholism may be a genetic predisposition, and that a child of an alcoholic parent runs a much greater risk of becoming an alcoholic. Tobacco Tobacco is used in many forms, including cigarettes cigars, pipe tobacco, chewing tobacco, and snuff.
Cigarettes are the most common type of tobacco used by teens, followed by chewing tobacco and snuff.
Many harmful ingredients in tobacco, such as nicotine, carbon monoxide, and hydrogen cyanide are absorbed into the body through the lungs. Tobacco acts both as a stimulant and a depressant. A beginning smoker will experience euphoria, lightheadedness, giddiness, dizziness, elevated heartbeat and respiration rates, and a tingling sensation in the hands and feet. A chronic smoker will suffer from a diminished sense of smell and taste. These physical withdrawal symptoms last for about one to three weeks.