Public fragrance ban

Banning smoking in public places is becoming more common, and in places where there is no ban it's a common topic of discussion. Drinking alcohol is banned in some public places. What's the next step in making cities more pleasant/bland (depending on your point of view)? Halifax, Nova Scotia, Canada is discouraging the wearing of fragrances in public because the chemicals in them can make some people ill. A couple of places in California, USA have also banned fragrances in some situations. Will it become more common?

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