Actually thinking about it they were probably referencing the smoking policy. You used to be able to vaporize on flights legally. Now you cannot. They are probably idiots who were confused. It's like saying I couldn't take my Insulin because you know, random arbitrary reason. Completely illegal. Never policy. Shocked Air Canada actually considered not refunding him as they're definitively open to a lawsuit - one that would probably be open to punitive damages to prevent such ridiculous behavior in the first place.