The unavoidable reaction that occurs when someone smells something intense. It is continueous sniffing the source of a scent or it is the continueous sniffing of an odd scent until they can locate the source of it.
someone smells a scented candle, they like the scent so they have a nosegasm
OR
someone passses gass and another person smells it then has a nosegasm to find the source of the scent.
