There is a law prohibiting smoking in public areas, working areas, like banks etc., and restaurants must have non-smoking areas. Until we start DEMANDING what we are entitled to by law, it won't happen. I usually put up a fight in such places, I reach the person in charge and file an official complaint if someone smokes where he is not supposed to. I also ask for a non-smoking area, making sure restauran owners know that I wnat one as a customer. If all those who care do the same, instead of just giving up, it will happen. I was fighting for this since 5 years old, putting up fights on ferries, planes, etc. Yes, 30 years ago people smoked ebven in the non-smoking areas of transport means. Well, my -and other people's - efforts have paid off in these fields, as you probably have noticed. So don't give up, demand, threaten, complain, reward those who have non-smoking policy. Fort example, I go to Starbucks, which is non-smoking, and I prefer restaurants that have non-smoking areas.
Asimenia, you don't need to lie, you are in the right and people should be ashamed of smoking in your shop, not vice versa. You can put a no-smoking sign, and if someone complains, you can say that other clients -e.g. me - are bothered by smoke and by smelly clothes. Also, in the paidotopos, it is preposterous to smoke! tell the owner that perhaps some parents will not come back, but there are many who don't go there now as it is, because of smoking. Get signatures if need be, call the police if she still refuses, and tell her that you will shut her down by law unless she prohibits smoking! Taking action is the only way to help, otherwise we are part of the problem ourselves if we accept the situation!