You won’t see benefits if your sample only includes addicts! But some people’s drug habits are objectively not addiction. For example, someone who takes LSD 3 o

You won’t see benefits if your sample only includes addicts! But some people’s drug habits are objectively not addiction. For example, someone who takes LSD 3 or 4 times a year, with months in between. It seems quite plausible to me that this could be beneficial to them whereas someone taking it say twice a week would see detrimental effects.