You didn't mention "magic" mushrooms. I suspect these come under the category of what you call poisonous mushrooms. Poisonous however is a relative term. Everything is poisonous if you take too much. In small quantities however some substances can be very healing.
For example, table salt (sodium chloride) can kill you if you take too much. The same with water.
The same with Borax (which, on the poison scale is less poisonous than salt). Borax however can have HUGE health benefits if taken in very small doses. I'm happy to share info about this and other so called poisonous substances which can help to cure virtually any disease. Just ask if you want to learn more.
By the way, i'm not advocating the use of "magic" mushrooms, and for sure one has to be very careful and know exactly what is being taken. They can however give a filtered glimpse of other realms so potentially be helpful in the awakening process, if guided well and only used perhaps once or twice. More than that would be a distraction from waking up.
Namaste
Atma