I very much doubt it. Ever since strauss-leightnen syndrome was repackaged as add some 40 years ago, Ritalin (methylphenidate) & amphetamines were used with varying success in school children, I am not aware of any convincing evidence for addiction. Rather, the problem is young adults seeking Adderall or an amphetamine for their well rehearsed litany of subjective difficulties that fit adhd.
Decrease. Persons with add who take medications are less likely to be drug addicted in the future.