I suspect it's due to cannabis' well documented expectorant effect.
Cannabis makes you cough out more of the carcinogens, while nicotine constricts the lung passages, trapping them.
psteve Reviewed by psteve on . What I heard from a knucklehead My auto shop teacher once told me that people who smoke marijuana and Tobacco at the same time are 8 times more likely to develop lung cancer. Is my balding 26 year old auto teacher know what he's talking about? Rating: 5