Sorry, but there's a fair amount of misinformation in this topic. Water vapour in the lungs is not particularly dangerous... otherwise we couldn't all take hot showers, baths... saunas etc. That's not the problem (and inhaling smoke into the lungs is undeniably more hazardous). The deaths related to vaping have been linked to a form of Vitamin E added to the vape mixture. This is not standard practise for nicotine liquids, or cannabis liquids. It's only appeared on the black market, for unscrupulous sellers bulking out THC vapes.
The problem with this is that this chemical behaves like an oil, therefore congesting the lungs and leading to lipid pneumonia. But let's not pretend this is a widespread problem with vaping - given the millions of vapers out there, the current cases constitute an absolutely tiny proportion. People are NOT dying fast from vaping. Cases of respiratory disease are falling, thanks to fewer people smoking.
There is no significant damage done from pure THC, nicotine or water vapours being inhaled into/exhaled from your lungs. Far less than noxious smoke containing tar and tens of thousands of other compounds. The current drama has just been stirred up to give Trump something to campaign on. Vaping is a huge boon to public health, as the majority of independent medical experts would attest to.
It's just a reminder that people shouldn't vape (smoke or eat!) anything if they're not completely sure what's in it. You're only going to run into trouble if you end up vaping something unvapeable. I vape e cigs and cannabis buds, hash and concentrates. But I don't buy those pre-filled THC carts, I buy empty CCells and fill them with pure distillate I've sourced myself. I'd try them from licensed dispensaries in legal states, but I'd never risk buying one from the kid on the corner...