[aschreyer]

The most likely risk are not the majority of psychedelics themselves, but the quality of the substance you are getting as well as potency and "therapeutic" window. As they are controlled substances, what you are getting is often synthesised from reagents that are known carcinogenics and poorly purified. In many cases, it is not the real substance but a replacement or a mixture of various other chemicals that is supposed to mimic superficial effects. In addition, some psychoactive substances are active in the ug range and therefore have a high likelihood of leading to severe side effects because of overdosing. Also, the dosage window and thus the difference between hypnotic and anxiogenic/severe side effects can be in the range of mgs as well. Therefore one should be cautious if you cannot get access to them in a controlled/legal environment and certainly should not try every research chemical or analogue that appears on the internet.