That's silly.  --  The chemicals coming off a hamburger grill are far more harmful than from marijuana smoke, which science has determined has no significant harms - not even to the lungs.

Vaporizing eliminates ALL possibility of harm to even the primary consumer.  -  There is no such thing as ANY harm from second-hand vapor.

Just because you may smell something does NOT mean you are being harmed by it.  ---  Brother.  -   People who insist on living in a sterile, pristine world are doomed to be forever disappointed and a pain to everyone else.