http://www.mensjournal.com/health-fitness/health/lsds-health-benefits-20130826

http://www.medicaldaily.com/how-magic-mushrooms-enlighten-brain-and-improve-psychiatric-conditions-311126

They have lots of benefits and medically legalising small amounts would not encourage it's use since very few people use it.

Psychedelics are non addictive and scientists have even said that banning psychedelics are against human rights.