Cannabis is - in my experience - fun, but medically neutral. Doesn't hurt or help me.

Methamphetamine or similar in recreational doses would probably be terrible for both my physical and mental health. I am aware of at least one person in my personal social circles whose entire life has overtly and drastically deteriorated from that addiction.

I have met a few people who find lithium the only effective treatment for their bipolar disorder. When they can actually get their hands on it, their lives improve significantly.

Methylphenidate (Ritalin) - in an extended release formula (Concerta) - is the most valuable tool I have to treat my ADHD. Thinking back on how my life could have been improved if I had it earlier on...is frustrating to say the least.

It turns out that lazy dichotomies are worthless.