led smoke from smokers. The widespread practice of smoking in buildings exposes nonsmoking occupants to toxic waste of tobacco under conditions where airborne contaminant removal is slow and uncertain. Over the past two decades, medical science has shown that nonsmokers suffer many of the diseases of active smoking when they breathe second-hand smoke from smokers. The most important of these are lung cancer and heart diseases, which kill so many people every year all over the world and especially in the United Kingdom.
             Tobacco smoke is a major hazard to the health of both smokers and non-smokers. Although not so severe as smoking the tobacco, the reviewers stated that passive smoking has been linked to the deaths of as many as 53000 non-smokers every year in the United St
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