Reefer madness was a propoganda film.
There are a few medical doctors in my family. My uncle ran the anesthesia group for the Miami/ Dade area for many years. He has practiced for like 40 years. He never mentioned pot can harm people. And he smoked it as well for a lot of his life.
Who has said different? You are quoting a movie as medical proof.
I would call it a classic straw man argument (as you stated RM was a propaganda movie with no scientific basis in fact). Rational science (as a basis) is double blind, peer reviewed. RM was never this to start with ..so cannot be used to argue against 'science' per se
Quote Cannabruh:
"My whole life I 'believed' we landed on the moon, I still would like to and am not saying I believe we haven't, Trump please take us."
imo - that is often the issue. You/We 'believed' in the moon landings to start with (you were, naturally like any one, too young to absorb the science behind it at the time (45 minute tv documentaries are not a place for hard, detailed science
Then, someone new (Mr.conspiracy A) came along at the right time in 'victims' educational development. Here they appealed to their sense of 'knowing the real truth' and twitched their belief system into supporting the conspiracy through various pieces of 'evidence' (which were not scientifically verified - but how could they be when Science is lying to start with).
Just to clarify my thought on believing and thinking. Someone 'thinking' the moon landings happened is very different from 'believing' they happened (there is a chasm of difference between these two words - especially in science and higher education generally).
Again though, the only people I'm really angry at are the people who profit from this in some way. 'Believing' in this I can understand. It is the main proselytisers I want to go and directly challenge science in an open venue ..but they never do. They have irrational demands/rules (and then claim to their followers they didn't, etc, etc). Or they flat out will not challenge science directly.
However, over the years many of their arguments have been shown to be false at best (out right lies at worst). Then (in true scammers fashion) the conspiracy theorist/s never addresses the concerns directly expressed about their 'research'. Instead they simply throw around a new argument (or angle) instead of answering their detractors directly (a classic trick of the conspiracy theorist - there are many other tricks; like quoting pseudo science to create strawman arguments they can then argue away).
This stuff fails abysmally when faced with the scientific method ..which is why they steer so far from the scientific world and skate around in the fringes looking for victims to leech onto.