You don't get secondary drinking any more than secondary snuff-taking. Smoking is a peculiar type of a habit that imposes itself on other people, and that's why there's a case for treating it differently.

Mind, the other thing like that, which does impose itself on people in the same room is singing and music. But I think that should be reasonably safe in Ireland anyway. (Maybe one can envisage some test case involving bodhrans.)

I'm pretty sure that native ingenuity will find ways to ensure that this change has interesting unforeseen outcomes. I gather that there's a big vogue for outdoor patio heaters and gazebos in Irish pub car parks now. All the ciggy smokers and th dope smokers huddled uo together roun the little pot stove...

Snuff taking, and nicotine inhalers with Celtic Crosses engraved on them - that'll be all the rage soon enough.