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Like TLomon mentioned the tobacco industry is part of a well known conspiracy of the past. The tobacco industry was behind a PR campaign that counteracted scientific evidence which linked cigarette smoking to lung cancer.
Final truth of the matter is that smoking of tobacco probably DOES increase ones risk of cancer -- but mainly by reducing the bodies defenses to pneumonia and a host of other respiratory infections -- and therefore facilitating or enabling some (currently unknown) viral and/or bacterial root cause.