Early results from a new study in JAMA show that it may not be smart to take modafinil as a “brain booster.” The drug may have a greater risk of addiction than it was first thought to have.The small pilot study involved 10 healthy men. Taking modafinil increased the dopamine in their brains. Dopamine is a neurotransmitter that plays a major role in addiction.The brand name for modafinil is