As Coolpool mentioned, super handy for people who're looking to quit smoking - and sometimes a puff is nice, 'cause they've got ten billion fuckin' flavors. Though it's allegedly more efficient to vape weed than smoke it, I find it's really slow and kind of a pain in the ass, and it seems to me that vapes require more maintenance than pipes or whatever. Also, they're expensive as fuck compared to said other pieces. Put me down for "try, but never buy".
Anyone who says "vape nation", or any variant thereof, unironically is pretty fucking degenerate, by the way.