Shisha pipes: Is smoking them really harmless? - BBC Future
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Is bong smoke really as harmful as secondhand cigarette smoke? - Gothamist
How Does a Bong Work? Benefits, Risks, and Myths
Bongs create more secondhand smoke than cigarettes, study says - Los Angeles Times
Secondhand marijuana smoke from bongs more dangerous than cigarette smoke
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Smoking tobacco bong - YouTube
Secondhand marijuana smoke from bongs more dangerous than cigarette smoke: study | Fox News
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