Effective June 19, 2009, the state of California has added marijuana smoke to its Prop 65 list of chemicals that are known to cause cancer or reproductive harm. Marijuana smoke was considered by the Carcinogen Identification Committee (CIC) of the OEHHA Science Advisory Board at a public meeting. The CIC determined that marijuana smoke was clearly shown, through scientifically valid testing according to generally accepted principles, to cause cancer. Consequently, marijuana smoke is being added to the Proposition 65 list, pursuant to Title 27, California Code of Regulations, section 25305(a)(1) (formerly Title 22, California Code of Regulations, section 12305(a)(1)). Official proposition: http://www.oehha.org/prop65/prop65_list/Newlist.html

This poses interesting questions on the logistics involved in the Prop 65 disclosure requirements. Are marijuana smokers going to have to put warnings on their cigarettes to warn anyone who may come in the vicinity of the smoke? What about people who use marijuana prescribed for medicinal purposes in their homes? Will they need a sign on their door warning anyone who may come in? Are these new changes going to affect California’s other laws that currently legalize marijuana smoking for medical reasons?