I live in an average sized semi. If I'm in my reasonably sized garden, I can smell my neighbours' shower gel when they showering their bathroom window is open.
I can smell the flavour of crisps being eaten by someone 3 rows in front of me at the cinema/theatre.
I can smell the personal scent of the person behind the bar (don't mean BO).
I can smell when a woman is on her period. Probably not always because I'd have no way of knowing! But sometimes I know.
Anyone else? I know I've got a strong sense of smell because I can often smell things other people around me can't but just wondered how common it is. And whether or not these are examples of it! Or whether they're things everyone can smell...