Answer:
1.These effects can be physical and psychological, and can ... harm to organs and systems in your body,
2.Of the more than 7,000 chemicals in tobacco smoke, at least 250 are known to be harmful, including hydrogen cyanide, carbon monoxide, and ammonia (1, 2, 5). Among the 250 known harmful chemicals in tobacco smoke, at least 69 can cause cancer.
3.Drugs that are stimulants -- like meth, heroin, cocaine, and ecstasy -- can make you clench or grind your teeth. This weakens your teeth and can even make them break. It also can cause pain in your jaw.
