Where there's smoke there's.... nevermind.

Electric cigarettes! Of course. These things glow at the end when you inhale and atomise the air turning it into water vapour, dispensing the nicotine. Supposedly a good way to quit and/or get around smoking bans - try explaining it to the bouncer punching you in the head when he thinks you've sparked up in a bar. You'll both have a laugh about it later. Personally, I'm waiting for the doobie version. Brilliant.
You can pick up one of these Milano Cigarettes for around £40 here.