That's not true at all. "Hallucinogens" is a group of drugs so wide that it already includes many drugs already used in conventional medicine. Just go through the many drugs on this list[1] of hallucinogens, you'll quickly find references to potential medical benefits.
Just "potential benefits" though, since there hasn't been nearly enough research done on most of them yet. A lot of them haven't been scientifically studied at all, the basic work Shulgin did is the only things we know about them.
The most common hallucinogens (mushrooms, LSD, MDMA) were considered as very promising by many in the field until research of the potential benefits of them essentially was banned for decades due to the drug war, but that has begun to change now. [2][3][4]
Recent research indicate that certain hallucinogens may be very useful in treating a variety of medical issues - like depression, anxiety, alcoholism, cluster headaches, PTSD, etc etc. [5][6]
[1] http://en.wikipedia.org/wiki/Template:Hallucinogens
[2] https://www.apa.org/monitor/2010/11/psychedelics.aspx
[3] http://www.psychiatrictimes.com/articles/research-psychedeli...
[4] http://www.theglobeandmail.com/technology/science/brain/high...
[5] http://en.wikipedia.org/wiki/Psilocybin#Medical_research
PS: You just linked several recent studies which hardly supports the 'completely suppressed' due to drug war argument.
B: While they made me a side effect, it seems the benefits come from having experiences, not as ongoing medication like SSRIs. That is, people can have a deep experience, possibly have audio and/or visual hallucinations, then recover for a day and have a significantly different outlook on life.
https://www.apa.org/monitor/2010/11/psychedelics.aspx
http://www.theglobeandmail.com/technology/science/brain/high...
http://www.psychiatrictimes.com/articles/research-psychedeli...
Considered by whom? The "cost"/benefit balance is entirely a matter of opinion, and in my opinion the choice should be left to the sufficiently educated patient. If there are compelling reasons why the patient shouldn't be making that choice, I'd be interested to learn them.
LSD and Mushrooms can be an effective treatment for cluster headaches (a debilitating disease which is said to be "The most painful medical condition known to science").
http://en.wikipedia.org/wiki/Cluster_headache
Interestingly, the effect lasts for weeks after the dose is taken (and the hallucinatory effects have worn off).
Stories like this
http://news.sciencemag.org/brain-behavior/2011/06/lsd-allevi...
make me deeply regret the current political/conceptual barriers to research on psychotropic compounds. I think we're missing opportunities to help quite a lot of people.
Don't let that stop you though GP! It's a fun project and very satisfying to see your mushrooms finally sprouting up after a month or two of work. The risk of getting caught is low, and even if you somehow did, it would probably still be worth the penalty if they have a positive effect on your wife's headaches!
Eh? Studied extensively? Last time I checked they're all schedule I and haven't really been studied since the 70s. On top of that, in the few recent studies that have focused on them, hallucinogens do seem to be medically useful. MDMA for PTSD, psilocybin for terminally ill patients, etc.
http://www.heffter.org/research-jhus.htm
takeaway: Psilocybin may have a long-term anxiolytic effect.
People also use alcohol, caffeine, and nicotine vary frequently.
If you mean Hallucinogens, they have been studied extensively and don't seem to be that medically useful. There where a few appetite suppressants which where discontinued and Nitrous oxide still sees some use but it's risky.