Ketamine
https://aeon.co/ideas/ketamine-trips-are-uncannily-like-near-death-experiences
The article provides background into the research being done on Ketamine. Ketamine (Special K for any party people) has been shown to provide people with a near death experience, mainly by the impact that it has on the brain and chemicals that are released. These chemicals are similar to what the brain experiences near death.
It's also being used by small clinics to treat patients who are suffering from severe PTSD and depression. It’s curious to know that now Ketamine is also used in the treatment of depression and PTSD, with positive results. Coupled with the increase legalization of cannabis maybe we are getting closer to accepting illegal drugs into our society as an alternative to the legal drugs that we consume from the pharmacy.