Smoking is a greater cause of death and disability than any single disease. Tobacco smoking is a known or probable cause of approximately 25 diseases. Why it is so harmful? And why then millions of people smoke?

Tobacco is a plant grown for its leaves, which are smoked, chewed, or sniffed for a variety of effects. It contains the chemical nicotine.

Tobacco and especialy nicotin contain over 19 known cancer-causing chemicals and more than 4,000 other chemicals. These include acetone, ammonia, carbon monoxide, cyanide, methane, propane, and butane.

The effect of nicotine in first time or irregular users is an increase in alertness and memory, and mild euphoria. Nicotine also disturbs metabolism and suppresses appetite. Many people like it.

But smoking is not a pleasure, it may cause:

There are a lot of ways to quit smoking, between them - medicines treating.