when compared with tobacco smoking, cannabis smoking is associated with a nearly five times greater increase in blood carboxyhaemoglobin levels and about a threefold increase in the amount of tar inhaled
one-third more of this inhaled tar is retained in the respiratory tract than in cigarette smoking
cannabis smoke contains the same constituents (apart from nicotine) as tobacco smoke, including bronchial irritants, tumour initiators (mutagens), tumour promoters and carcinogens
cellular dysplasia has also been observed, suggesting that, like tobacco smoke, cannabis exposure has the potential to cause malignancy (1)
tar from cannabis smoke also contains greater concentrations of benzanthracenes and benzpyrenes, both of which are carcinogens, than the tar in tobacco smoke
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