There are many people with ADHD and a history of substance abuse that take ADHD medication. I think it takes the right clinician and one with experience in this area, which certainly may be challenging to find.
What You Should Know About ADHD Meds if You Have a History of Substance Abuse
ADHD Doctor? Psychologist? Therapist? Finding the Best Treatment Professional
Penny
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism