I received my first one as a birthday present... a $300 Smoking Everywhere kit. I hadn't been prepped, I was only vaguely aware of their existence, and I wasn't terribly interested...
I didn't take it well at all. I didn't want it, it was crappy equipment, and I still have all but one of the cartridges that came in the starter kit. Didn't take to it at all.
Someone has to want to quit. Otherwise, you're very possibly wasting your money and maybe some goodwill. I'd definitely suggest that you feel people out first. If someone expresses interest, by all means go for it.
I've given a few kits away to people who were interested in mine. Not as a birthday or Christmas present, but just to help someone I knew was interested find out if this was for them. There's nothing wrong with that...
Us (now ex-)smokers can get militant when someone butts in (pun intended) and tries to take away our preciouses... Just a thought...
I'm just glad I came back around to it, in due time, on my own...