I remember discussing this very thing back when i was in school in science class. Your brain sometimes misfires its communications to the body.If i remember correctly its called a synapses overload. Its nothing harmfull everyone has it happen now and then. I smell a perfume from when i was a child but i cant remember who wore it, i just remember the smell.
I also had this effect too but in school, while going to my next class I smelt a perfume that was sweet and also a rememberable smell but thing is no one was near me, i also smelled candy in the classroom when nobody had candy, and now since im home, im smelling white, powdered sugar donuts. and a little bit orange juice when I dont have any donuts or sweet things and even juice. I told my mom and my sister about this, and they think im joking
So you probably won't see this as you asked 11 years ago but I am experiencing this all day today and it is freaking me out. Did it go away for you?
I smell smoke ...yet no one is smoking anywhere near me
Your lucky your smelling something sweet than something nasty. LUCKY XD. But no you do not have a problem, but this is quite interesting, it could be that you think about something sweet like doughnuts and somehow can recall the smell like a mind trick.