Key points from article :
Secondhand marijuana smoke from bongs can be more dangerous than secondhand cigarette smoke.
Fine particulate matter penetrates the respiratory system further than larger particles, which is why it can be more harmful.
Researchers measured levels of the matter before, during and after eight social-smoking sessions of cannabis.
Used an aerosol monitor to measure the air quality before, during and after each session.
Secondhand cannabis smoke have four times the amount of fine particulate matter than secondhand tobacco smoke.
Contrary to popular beliefs, bong smoking is not safe.
“Second hand cannabis smoke can affect the health of children who are nearby or other people in pretty serious ways.” - Katharine Hammond, co-author of the study.
Study by University of California published in the JAMA Open Network.
