Research was again spotty regarding drugs and acne. I found no published studies or trials specific to drugs and acne, so I took the next logical step and looked at how drugs affect hormone levels. I found information on marijuana, cocaine, and ecstacy (MDMA) but not methamphetamines or other drugs. A synopsis of what I found is on the new drugs and acne page.
If I had to sum it up in two sentences: Drugs may affect hormone levels, which may or may not in turn affect acne, but as of this point in time, more research is needed. Additionally, drugs can have negative effects on stress levels, picking, and regimen adherence which may prove detrimental to acne symptoms.