Smoking is one group of people inflicting their lethal habit onto others. That is no longer significantly the case in public places, now that smoking is no longer happening in pubs and so forth.

So going on about it in an insulting way is no longer relevant. It's an activity which some people enjoy, and which exposes them to health risks, but then that applies to a lot of things - motor racing, bungy jumping, gay sex... Nobody's business to slag people off for going in for stuff like that, so long as it's not forced on the rest of us.
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I see the Isle of Man has now brought in a ban - but including provision for smoking rooms in hotels and private clubs. Sensible enough - so long as the smokers look after these themselves and don't expect staff to do so.