Medical Mouse

E-cigarettes were invented by Hon Lik of electronics company Ruyan in Beijing, China. Ruyan sold its first electronic cigarette in May 2004, and e-cigarettes have been growing in popularity ever since. Accurate figures are hard to come by, but Ruyan - the world's biggest manufacturer - claims to have sold over 300,000 in 2008. Smart Smokers, one company which sells Ruyan's cigarettes in the UK, says sales are rising exponentially. In the US, hit TV show The Doctors featured the e-cigarette in the top 10 health trends of 2008. In a world where smoking is increasingly socially unacceptable, the e-cigarette looks like a success story in the making.