Smoking is the process of processing tobacco products in a special way, burning them with fire and inhaling its smoke. Inhalation of burning smoke from any common product can be termed as smoking, but inhalation of burning smoke from tobacco products is generally identified as smoking. Smoking is one of the leading causes and carriers of many diseases, including tuberculosis and lung cancer , according to the World Health Organization . Studies have shown that cigarette smoke contains 56 toxic chemicals, including nicotine. According to a 2010 World Health Organization (WHO) study conducted in 192 countries , approximately 6,000,000 people worldwide die each year as a result of second-hand smoke (secondhand smoke), even if they do not smoke themselves . Of these , 1,75,000 are children. Children suffer from pneumonia and asthma due to secondhand smoke. It has a more detrimental effect on women than that. About 61,000 women worldwide die each year as a result of secondhand smoke . A similar study, conducted in 2004, found that 40 % of those exposed to secondhand smoke were children , 33% were men and 33% were women. It also shows that people in Europe and Asia are suffering the most due to secondhand smoke.