New Study from Science Direct Journal shows that the marijuana joint's emission rate was 3.5 times that of a tobacco cigarette:


Scroll down for other recent studies...

Marijuana Smoke/Vaping Impacts on nonsmokers
This Public Alert from the California State Tobacco Control Program (State Health Department) provides the scientific basis for regulating exposure to secondhand marijuana smoke and vape aerosols.
TCS Partners_FINAL-Tobacco-Marijuana-SHS[...]
Adobe Acrobat document [7.3 MB]

Marijuana smoke is harmful and should be regulated in multi-unit housing, according to Americans for Nonsmokers Rights:

Protect nonsmoking residents from marijuana smoke in multi-unit housing

Tobacco, Marijuana and Vaping Impacts on the Coronovirus (COVID-19)
Fact Sheet describes how tobacco, marijuana and vaping may make the immune system more vulnerable to infections and COVID-19 virus.
Fact Sheet on Tobacco Marijuana and Vapi[...]
Adobe Acrobat document [424.1 KB]

New Study shows significant increase to the National Poison Control Centers from states that legalized marijuana:

The association between recreational cannabis commercialization and cannabis exposures reported to the US National Poison Data System
First published in Addiction:
20 February 2020
Recreational cannabis has been legalized in 11 states and District of Columbia (DC) in the United States. Among these, 10 states further permitted retail sale to provide a legal supply to adults. This study examined the associations of cannabis exposures with recreational cannabis legalization and commercialization. Conclusion:  An increase in cannabis exposures reported to the US National Poison Data System was observed following recreational cannabis commercialization in the United States. 



Check out this one minute Public Service Announcement broadcast on television:


Myths and facts about marijuana smoking in Marin and in California.  

Marijuana smoke damages lung health. 

Marijuana has about 50 percent more of some toxins than cigarette smoke. Because of how it is typically smoked (deeper inhale, held for longer time periods), marijuana smoking leads to four times the deposition of tar compared to cigarette smoking. 

Within a few minutes after inhaling marijuana smoke, a person’s heart rate speeds up, or may even double.

One Minute of Second-Hand Marijuana Smoke Impairs Cardiovascular Functions. Effects Are Like Tobacco’s, but last three times longer.

(UCSF studies)

Damage is especially damaging to children and teens, according to CDC.

Article relevant to California's smoking laws:


In California, it is illegal to smoke (or vape) marijuana in public places, cars or anywhere where tobacco smoke is prohibited (even if it is medical marijuana). 

See above links that explain that there is no marijuana smoking or vaping in areas where tobacco use is regulated.

Common Question: Can you fly or do a road trip with medical or non-medical marijuana? Best to leave the flammable, stinky stuff at home, and no type of cannabis is legal on planes, according to this article:


  For more Marin specific information, visit: 


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