What are the harms of smoking cigarettes?

Smoking cigarettes is very popular among the youth these days. However, some elderly people like to smoke beedi. Smoking is also seen as a social evil. Smoking is prohibited in most places. Some of the most harmful chemicals in cigarette or beedi smoke are nicotine, tar, carbon monoxide, hydrogen cyanide, formaldehyde, arsenic, ammonia, lead, benzene, butane, cadmium, hexamine, toluene, etc. These chemicals are harmful for smokers and those around them.