Just to add to your (excellent) comment; in the UK you can be prescribed medical marijuana but it has to be done by a consultant level doctor and a multi disciplinary trial. The most important disqualifying factor is any history of psychosis, if they see that on your medical records they will not write you a prescription.
So I would a assume there is some published medical literature they are following which states cannabis exacerbates the symptoms of psychosis.
As much as I dislike the fact that the "flagship" instance for lemmy is an echo chamber that bans for political wrong think, I still think Lemmy on average is a positive and it isn't funded by ads or vcs so it should be proof against the most common avenues for enshittification.
So I set up a recurring donation despite being someone that would 100% get banned by the people I'm donating to if I were to comment on their instance.
Same way I can't stand people using one negative within a larger political platform as an excuse to parrot anti-electoralism I feel like I shouldn't use one unfortunate facet of the fediverse as an excuse not to donate towards its continued development.
Support "better" rather than waiting for "perfect"