These really are very good. I tried one for a while in a couple of local pubs - it's a strange experience to say the least!!! You spend half the time embarrassed as most people can tell it's not real, and would probably question if it's worth it - may as well just stop. However the other half are the busy-bodies and finger waggers, and it's a lot of fun to wind these people up. Start smoking a realistic glowing fag that emits puffs of smoke and you hear the subdued comments as a wife subtly pushes her husband look at what she is seeing. After only a matter of moments you will notice them trying to attract the attention of the pub staff so that the smoker can be removed. Normally at this stage the landlord appears and is so miffed at my blatant disregard for the smoking ban he fails to notice the device I'm holding contains batteries. Then, the debate starts that it still produces smoke, and is therfore illegal in his pub - which it does not and it isn't. Luckily these devices come with cards that have the relevant laws printed on them which can be produced to settle a debate. Obviously the landlord won't like backing down, and the 'horrified' party at the next table will think it's a joke. So it's probably not something to try in a pub you want to get along with!