E-cigarettes are becoming trendy which is a real shame given the progress in fighting real cigarettes (for want of a better name). I see the following changes since real cigarettes were banned from indoor public spaces - (1) More people aware of the harm caused when smoking was allowed indoors, so serious it has been banned, (2) It is an inconvenience to stand outside and smoke therefore acting as a deterrent, (3) Smoking them is now seen as anti-social and an old habit.
The arrival of E-cigarettes has caused widespread confusion, even amongst my peer group, as there are no clear signs or guidelines as to whether they can be smoked inside or not. And without physical smoke they can be used secretly and very easily fall under the radar in bars and clubs. Along with different flavours and looks, they are fast becoming a new exciting habit, so I think that far from helping people quit, they are attracting new users.