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A comprehensive study of lung cancer mortality in UK asbestos workers based on 1878 deaths in the period 19712005 confirmed a multiplicative interaction of tobacco and asbestos exposure, an increased dose-related risk of lung cancer in never-smoking asbestos workers compared to the never-smoking general population, based on 32 never smoker male lung cancer deaths (SMR 95% CI 93192) (i.e., P ~ 0.06 one- sided), and a substantial reduction in lung cancer risk with smoking cessation [42]
Always consult a physician before making any decision on the treatment of a medical condition
There's little research on the subject, but a European study last year acknowledged the rise in cannabis allergy and its potential health hazard

Where You Can Vapeand Where You Cant Where You Can Vapeand Where You Cant California regulates vaping almost identically to smoking

doi: 10.1136/tobaccocontrol-2013-051130