Many of the hallucinogenic drugs are not physically addictive and in fact have positive effect on brain health. Many thinks that drugs automatically mean harmful but in fact psilocybin, LSD, etc can increase neuro-plasticity, increase connection and communication between different brain areas, they can even help to recover from brain injuries and can help treat clinical depression, ptsd, obsessive compulsive disorders and terminal cancer end of life anxiety. The problem is that people who generally unable to control their thought processes, thought loops, negative reactions while sober, often have the same lack of control while using these substances and can end up with a difficult experience. If you are in a bad head space, it is likely that you will be in a bad head space during your psychedelic trip, and instead of healing, you further traumatize yourself. I personally never had any bad experience on LSD or psilocybin, in fact all my experiences were revealing, instructive, therapeutic, constructive, helpful and inspiring. However I am not prone to depression or negative thoughts and I am quite good to control my own thinking loops, I don't normally lose control over my mood or my thoughts.
So for this reason, I cannot recommend these drugs for everyone because I don't know what is your headspace, whether or not you have manic or schizophrenic tendencies. But for the right person, these drugs can be amazing, therapeutic, healing, revealing, spiritual, fun, joy, emotional revelations, and physically healing an unhealthy brain by creating neuroplasticity. A brain with no neuroplasticity is a sick brain, an elderly brain. A youthful healthy brain has neuroplasticity. And these drugs are not physically addictive and almost impossible to overdose on them. However, if you cannot control your thoughts or mood while sober, then I don't recommend them unless you are doing it with a therapist under medical supervision.