Tobacco use in any form is harmful, whether smoked or smokeless. Cigarette and beedi smoking is number one risk factor for lung cancer .Smokeless tobacco use is also associated with cancers of the lip, oral cavity, pharynx, digestive, respiratory and intrathoracic organs . The toxic chemicals in tobacco damage the cells in the lungs, causing them cells to grow abnormally .
Cigarette smoking increases a person’s chance of getting lung cancer by 15 to 30 times and these persons are more likely to die from lung cancer than people who do not smoke .Lung cancer risk increases with the number of cigarettes smoked each day and with increasing duration of time the person has been smoking. The risk decreases if the person quits smoking.