From my position as an observer of someone who has struggled with substances for a long time, Amphetamines are the worst of that list. My friend recovers from Alcohol and cocaine fairly quickly once she stops taking them. Cannabis (CBD, specifically) calms her down - it would be a great help if she could get it regularly.

Cough medicine is bad, but it's not nearly as potent of an addicting substance as the others on the list. She's used antihistamines as a hallucinogen before, but is not really tempted by them.