Here’s another study on how taking stimulant medication for ADHD does NOT increase the chances of substance abuse.
People who started taking stimulant medication at 6 or 7 years of age had the same substance abuse rate as non-ADHD people.
In addition, people who started taking stimulant medication when they were 8 to 12 years of age had a higher substance abuse rate than people who started taking stimulant medication at 6 to 7 years of age.