I think the sense of smell is the most powerful sense. Pheromones (sp?) are pretty interesting and I have heard that they are pretty good at doing influencing the subconcious of people. Worth noting is that you really cont control what you smell. You dont know a smell is around till it is oo late. Some people cant even control that they smell! All I really know for sure is that in the back of magazines I can buy male or female pheremones to improve my sex life. Learning to utilize that power is beyond me though.
On an aside, I heard that people with schitzophrenia had smaller amigdalas, which lead me on a thought path that perhaps our sense of smell helps us to interpret reality. Just a theory I havent looked into.