After a few days with this, it still kicks, almost too much, kind of harsh, at 18mg. Vapor production is minimal, I'd say nearly invisible from a few feet away. It's a very thin liquid (have to be I guess, definitely no VG in there), so I only fill my cart with about 6 drops at a time, but those drops seem to last a very long time. The menthol flavor gets on your nerves after a while, but it still quiets the nicotine craving after just a couple of puffs. YMMV