I've heard before that one should make a bracha when passing by a bakery that has a pleasant smell of what's being baked. What is the source for this halacha? What is the custom in this, do we yes make a bracha or not? If not (and the halacha says yes to) then why not?
In Mishna Brurah 216:54... The discussion is brought (see Shulchan Aruch and Rama) whether a bracha is said when one smells hot bread and what nusach is said (rayach tov...bpeiros ...bpas) it seems since it is a safek we try not to intentionally smell breads or cakes for pleasure in order to take ourself out of a safek which is at hand.