The efficacy and safety of the treatments are not the issue. The issue is when government uses the threat of violence to prevent people from accessing substances that cause no harm to others.

I agree that people should not use it as treatment without seeking help, but there are far more dangerous substances you can buy over the counter.

E.g. acetaminophen/paracetamol causes a range of deaths via liver failure every year, yet not only do we allow it to be sold, in many countries it is now allowed to be sold mixed with codeine - a highly addictive opoid, creating an incentive for addicts to push the limits of their intake of highly toxic compound.

And yet people worry about cannabis - a substance where the LD50 is so high we don't know what it is, or if there is one (short of choking on it...)

Attack quackery, sure. But if you are to go after quackery, then go after current drug laws too, because they are not based on a concern over science, efficacy or safety.