Or people have been taking these drugs (especially stuff like ayahuasca) for thousand of years anyway, and the rise in diagnoses is because we diagnose more now

Or people have been taking these drugs (especially stuff like ayahuasca) for thousand of years anyway, and the rise in diagnoses is because we diagnose more now (and also have more people, live longer etc.). Most of humanity throughout history lived very stressful lives, and those with severe problems mostly just died or suffered undiagnosed rather than getting help.