Brilliant! This is like a Pavlov experiment and it makes you look gentlemanly! Eating some yourself is a good idea too to take away possible suspicion and it looks more natural because who can resist candy?
Dark chocolate is probably most effective, but it doesn't taste as good.
Dark chocolate needs to be "chased" with milk or something, like chasing liquor with coke... some chocolate recipes and blends are probably more effective than others.
Are their any chocolate experts here that could expand on this?