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| Name | Current message text |
|---|---|
| h English (en) | ===Secondhand cannabis smoke=== A 2022 study found that smoking cannabis using a bong can greatly increase background levels of [[Particulates|fine particulate matter]], a [[carcinogen]], in an enclosed space such as a living room. After 15 minutes, mean levels of particulate matter were more than twice the [[United States Environmental Protection Agency|Environmental Protection Agency]] hazardous air quality threshold, and after 140 minutes, the concentrations were four times greater than those generated by smoking tobacco using a cigarette or [[hookah]]. This suggests secondhand cannabis smoke from bongs may present a health risk to non-smokers. |