I've been researching portable vaporizers for the past few hours now. The potential toxicity of the materials used is a topic that gets mentioned seldom. A few discussions are floating around here and there, but there's no definite source of info. The general gist is that you shouldn't buy cheaply made knock-offs (which is obvious IMO and not super helpful). The safest vapes my research has turned up so far : 1) Arizer Solo - Oven is ceramic (though, there were a few reports of this coating peeling) 2) Ploom Pax - Pathway is stainless steal (assume oven is as well) 3) Magic Flight Box - Their website is pretty vague about the material of each specific part, but they say they use steel and no bonding chemicals. What do you guys think is the most non-toxic portable vaporizer?