We know more about: The carcinogens in tobacco products, and its addictive substance, nicotine, than the toxins in smoked cannabis, and its psychologically addictive substance tetrahydrocannabinol. I would not view it as "safer", just less well studied and understood.
Answered 5/16/2013
5.8k views
Basically,: The same risks as passive smoke from cigarettes!
Answered 5/7/2016
5.9k views
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