Over a third of all cancers are related to the use of tobacco. Tobacco-related cancers constitute a major proportion of the so-called ‘preventable cancers’— cancers related to dietary habits and lifestyle. Both epidemiological and experimental studies have clearly shown that chronic exposure to tobacco in any form induces changes in the cells that lead to the development of cancer. Smokers have a higher risk of lung and throat cancer while those who chew tobacco run an increased risk of cancer of the mouth throat and food passages. The brunt of the effect of tobacco is borne by the lungs in smokers