Voici quelques chiffres: (SHS=Second Hand Tobacco Smoke)

There is clear scientific evidence of an increased risk of lung cancer in non-smokers exposed to SHS. This increased risk is estimated at 20% in women and 30% in men who live with a smoker (2). Similarly, it has been shown that non-smokers exposed to SHS in the workplace have a 16 to 19% increased risk of developing lung cancer (3). The risk of presenting lung cancer increases with the degree of exposure. The Californian Environmental Protection Agency (Cal EPA) estimates that SHS causes 3000 deaths each year due to lung cancer in non-smokers.

Other health effects of SHS
It has also been shown that non-smokers exposed to SHS have a 25 to 35% increased risk of suffering acute coronary diseases (4). Chronic respiratory conditions are also more frequent in non-smokers exposed to SHS (5). There is evidence linking SHS to other adverse effects in adults including exacerbation of asthma and reduced lung function.

Source: World Health Organisation

Et puisque Phillip Morris est mentionne:
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Et pour finir, deux petits liens pour la route: Lien et Lien