International
US researchers have discovered that smoking cannabis via a bong can up the levels of fine particulate matter in the room with you by up to 1,000 times. The researchers measured the quantity of PM2.5 - particles with a diameter of 2.5 micrometres or less that have been linked to negative health effects - during multiple hotbox sessions, and say cannabis bong smoking in the home generated four times more PM2.5 concentrations than cigarette or tobacco hookah smoking. They add that after the levels peaked during a two hour smoking session, they stayed high for 90 minutes after finishing, reducing slowly. Importantly, the team found that the levels still remained at 10 times the background concentration after 12 hours post-smoke-up.
From:
Fine Particulate Matter Exposure From Secondhand Cannabis Bong Smoking
What The Study Did: The findings of this study suggest that social cannabis bong smoking in the home generates unsafe levels of measurable fine particulate matter.
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