The nature of those Shiitake Mushrooms between individuals

What are its effects? DMT is an incredibly intense, but short experience in which you'll lose total control of your body and experience powerful, completely alien hallucinations. The nature of  those varies between individuals, but with it, I get some of the "message" of ayahuasca complete with alien dreamscapes.

What precautions do you need to take? It's best to do DMT in a group, where one person takes it at a time and the others help administer it and watch the person under its influence. Find some place outdoors and with an epic view, then sit down and smoke it.