There’s no such thing as ADHD. ADHD is just a matter of willpower. Smart people don’t have ADHD. According to attention deficit hyperactivity disorder experts, these and other thoughts are among the top myths associated with ADHD. Edward Hallowell, founder of the Hallowell Centers, which helps treat people with ADHD and other cognitive and emotional conditions in Boston, New York City, San Francisco and Seattle, says holding tight to such thoughts does a disservice to the ADHD population.