For a rat in a box, chocolate increases the basal output of dopamine in the brain by 55 percent, sex by 100 percent, nicotine by 150 percent, and cocaine by 225 percent. Amphetamine, the active ingredient in the street drugs “speed,” “ice,” and “shabu” as well as in medications like Adderall that are used to treat attention deficit disorder, increases the release of dopamine by 1,000 percent. By this accounting, one hit off a meth pipe is equal to ten orgasms.
