Well I would be cautious with how frequently to take psychedelics... for myself once a season was always ok (for a decade). I've also been careful to attribute anything at all to the experiences... I just trip in the moment and get on with life. People seem to get caught up interpreting highly subjective experiences too much and even trying to promote these experiences to others as some sort of medicine, attempting to project their own well thought out interpretation of their experience onto others. I see the experience as a very personal thing, I'd never make it a part of the image as I see people do, or promote psychedelic use to others, and there isn't really any explaining what's going on in my own mind on psychedelics to others so I generally keep it to myself.
I hear people say things like "I studied mathematics physics, but then I did LSD. Now I am studying neuroscience"... like WTF sorry but I have no idea how LSD affected you, whether or not it actually had an impact on your life or whether you're just saying that to sound cool. Why did you even have to bring up LSD in the first place? Sorry, "but then I did LSD" does not carry any useful information. I find it annoying how people feel the need to "brag" about it sometimes... I'm sure you've met people like this too, where acid seems to inflate their egos.
That being said, I would personally choose to use a hefty dose of psychedelics once per week as opposed to habitual cannabis use, any amount of cannabis at all on a daily basis because I strongly feel that the damage excessive weed smoking can do to the brain is significantly underestimated. I have experienced extreme anxiety and full blown panic disorder as a direct result of hash oil abuse. I also experienced one month of physical withdrawal and years of post acute withdrawal syndrome. Therefore, I'm sure it does this to the odd human out there as well since I can't be the only one who got completely fucked with by weed... I even fiended it like a crackhead, I'd smoke a big bong rip and 10 minutes later I would crave another... that's sure as hell doesn't make any sense but I couldn't stop without getting help.
To be honest I think a lot of people who abuse the hell out of weed end up on anxiety meds / antipsychotics / opiates after years of fiending and abuse, due to how cannabis causes deformations in key brain structures leading to horrible side effects and also because it can prime the brain for addiction to other "rewarding" drugs but then again this is all just my opinion. Another thing to take into consideration is that weed will turn its back on cannabis addicts, all of a sudden many of them are simply unable to enjoy weed anymore despite being addicted to it since there can be a sudden onset drastic change in effects. I think if something happens on a true psychedelic like acid or mushrooms, it's more just bringing out something that was already there unless the drugs were bad or something like nbome... and I think if something happens to the mental health of a long term pothead, it's probably the thc abuse catching up with them and screwing their brains royally, like what happened to me. I used to love weed until I realized it had destroyed my mental health.
But then again I'm just talking about averages and my own opinion based on my experiences and those of my friends, everything should be taken on a case-by-base basis with all factors considered. Generally, moderate psychedelic use is reasonably safe.