A Swedish study of 150,000 people with ADHD has found that those taking medication for their symptoms are less likely to experience suicidal thoughts or behaviors, criminal convictions, drug abuse, accidental injuries, and road accidents. The researchers claim this is the most reliable evidence yet on the benefits of ADHD treatment. According to Zheng Chang at the Karolinska Institute, “This is the best approach, the closest to a randomised trial,” he says.
Source: https://www.newscientist.com/article/2492380-adhd-drugs-reduce-risk-of-criminal-behaviour-drug-abuse-and-accidents