Nicotine is super addictive when inhaled directly into the lungs, vape or smoke. Not the smartest thing to do, carcinogens or not. I would hardly call it safe.
I don't see anything unsafe about MJ vape. Actually, there is very little unsafe about MJ smoking when used in moderation for that matter, but that is another discussion, and probably one I should not be typing about while at work.
Don't ever expect the GB to be anything more than reactionary to this type of thing. They are always going to default to what provides the cleanest "appearance", and nothing more. Don't hold your breath...(pun intended).
d4g