Not quite. "Trying to get a high" is a bit misleading. A lack of self-control means ADHD people are more likely to dabble in drugs/booze etc, and it's a slippery slope from there.It is actually part of ADHD. (Don’t fall into the trap of thinking AdHD is only kids and involves running around a lot.)
restlessness and self destructive behaviour trying to get a high is why an awful lot of people with ADHD end up drinking, doing drugs, gambling, cheating etc etc.