San Francisco to ban e-cigarettes

San Francisco has become the first US city to ban sales of e-cigarettes until their health effects are clearer. Officials on Tuesday voted to ban stores selling the vaporisers and made it illegal for online retailers to deliver to addresses in the city. The Californian city is home to Juul Labs, the most popular e-cigarette producer in the US. Juul said the move would drive smokers back to cigarettes and "create a thriving black market"... More here.

What I don't get is that real cigarettes can still be sold, which are proven to be harmful, but not e-cigarettes which 'may' be harmful.