I've definitely had scents bring back memories of a place/time. I also have music do that, especially if it's something I was listening to a lot during a certain time period. Tori Amos's From the Choirgirl Hotel and Boys for Pele make me actually re-live the summer I spent writing like a madwoman, down to being able to smell the humid summer air.

Some of the dragons blood scents bring back memories of the first year I was with Storme and I was burning a lot of dragon's blood incense for ritual work, and it brings back all the emotion of us being first together and desperately madly in love and the manic highs and depressive lows and augh. It can be almost overwhelming, but I love the scent so.