Smoking is a cultural practice in which a substance, most commonly tobacco, is burned and the smoke tasted or inhaled. This is primarily done as a form of recreational drug use, as combustion releases the active substances in drugs such as nicotine and makes them available for absorption through the lungs. It can also be done as a part of religious or non-religious rituals, to induce trances and spiritual enlightenment. The most common method of smoking today is through cigarettes, either industrially manufactured or rolled with loose tobacco and a rolling paper. Other forms, though not as common are pipes, cigars, bongs and hookahs.
Smoking is one of the most common forms of recreational drug use. Tobacco smoking is today by far the most popular form of smoking and is practiced by over one billion people in the majority of all human societies. Less common drugs for smoking include cannabis and opium. Most drugs that are smoked are considered to be addictive. Some of the substances are classified as hard narcotics, like heroin and crack cocaine, but the use of these is usually limited to socially marginalized groups.(1)
In the other hand, smoking is bad for your health. Smoking harms nearly every organ of the body. Cigarette smoking causes 87 percent of lung cancer deaths. It is also responsible for many other cancers and health problems. These include lung disease, heart and blood vessel disease, stroke and cataracts. Women who smoke have a greater chance of certain pregnancy problems or having a baby die from sudden infant death syndrome (SIDS). Your smoke is also bad for other people – they breathe in your smoke secondhand and can get many of the same problems as smokers do.Quitting smoking can reduce your risk of these problems. The earlier you quit, the greater the health benefit.(2)
Source: (1) http://en.wikipedia.org/wiki/Smoking
(2) http://www.nlm.nih.gov/medlineplus/smoking.html
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Smokers 