For the non smoker in the vicinity, vaping is a thousand times more tolerable than cigarettes.
For the user, they're both stupid. The alveoli in the lungs have one function. They exchange oxygen with carbon dioxide - putting the O2 into the blood stream and removing the CO2 from the bloodstream.
How anyone in their right mind thinks heating shit to the point where it's steam or smoke and then putting that into the lungs, is completely beyond me.
I've even had stoners try and tell me that cannabis smoke is healthy for lung tissue. Get fucked. There's nothing healthy about inhaling smoke of any kind. If you like pot, eat it, don't fucking inhale it.