Popular 'Smart Drug' Isn't --- Research Says it's Useless, But Not Harmless

Modafinil, a drug prescribed for the treatment of narcolepsy and other rare wakefulness disorders, racks up a good $700 million each year. Surprised? You shouldn’t be. Experts estimate that about 90 percent of users are healthy, non-sleep deprived people who are in need of a so-called smart drug. However, a new study indicates modafinil, which is…