I've been vaping for several months now (buying carts here) in an effort to cut back on smoking, and the other day I had a kind of "sit-bolt-upright" moment when someone I trust explained the health and safety dangers involved in blackmarket carts, and that you can't be sure what you're inhaling unless it's made legit and professionally (purchased from a dispensary) so you can trust (and get to see results for) the tests which are done on it.
Obvious I know, but I hadn't really thought properly about it until now. Is there anyone here with some proper knowledge on this, on testing etc, who might be able to comment and perhaps put worried minds to ease?