Over the last few decades we've gone from smoking being acceptable everywhere - cinema, bus, all sorts of public buildings - to a situation where most of the smokers I know don't even light up in their own homes, because they don't want their children to be harmed (so they go into the garden to smoke). I'm not old enough to remember cigarettes being advertised as good for your throat and endorsed by doctors, but the ads are in the archives. E-cigarettes have overturned that assumption and we're almost back to the bad old days of smoking (electronically) being allowed everywhere. Great, no tar, but we can all inhale your nicotine and get hooked. I'm reminded of the advent of unleaded petrol - back when it was called "lead free" and cost more than 4-star, remember? - when it suddenly became alright to let your kids play in the petrol station because they weren't inhaling lead.