Breathing in second-hand cannabis smoke from a bong exposes people to four times more toxic pollutants than those from a standard cigarette, a study has found.The risks of second-hand cigarette smoking have been known for years, but this paper is thought to be one of the first to show marijuana fumes also pose a risk. Researchers at the University of , Berkeley monitored PM2.5 levels — a particle type that can worsen asthma and heart disease — in a room over the two hours bong smoking took place, and for two hours afterwards.
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