About the webinar:
Secondhand cannabis smoke (SHCS) is a novel exposure source uncharacterized in homes, containing known health risk factors including exposure to several hundred toxic chemicals, carcinogens, and fine particulate matter (PM2.5), many at higher concentrations than tobacco smoke. Decades of secondhand tobacco smoke (SHTS) research demonstrate causal links to cancer, respiratory and cardiovascular diseases, preterm birth, and decreased immune function. These concerns have not translated to cannabis bong smoking, a popular consumption method in social settings among young adults, wherein smoke is drawn through water. Understanding SHCS exposures is critical to identifying proper industrial hygiene controls and public health policies to prevent toxic exposures in homes, apartments, and cannabis smoking lounges. Our study measured PM2.5 from SHCS and found that social cannabis bong smoking generated fine particulate matter levels 10 times greater than the highest daily concentration in the days the Bay Area experienced orange skies from wildfires. Even 12 hours after cannabis smoking ceased, fine particulate matter decayed slowly so that the daily average concentration still exceeded US EPA daily standard by 6-fold. This presentation is the first study to quantify SHCS fine particulate matter levels from social cannabis smoking in the home and discusses the dangers of social bong smoking in the home.