What works and what doesn't work?

I'm approached all the time to sell products that claim to help a smoker quit. One company claimed that cravings would vanish by smelling a cinnamon scented wand. In a very unscientific experiment, I gave them out to all of the participants in one of my workshops. One third said that the wands did remove the craving, one third said the wands did nothing and one third said smelling the wand caused