DMT really shouldn't be grouped in with "drugs". It's a neurotransmitter. While it is beautiful and can give you euphoria, it's very intense and not exactly "recreational". It can also be very scary. At some point during your spontaneous generation in the womb, your pineal gland (which is responsible for creating many of the serotonin-related neurotransmitters you enjoy, as well as DMT) migrated from your throat into your brain, leaving a tiny tiny hole. In some people, such as Prahlad Jani for example, this hole can expand. During heavy meditation, some report having something called "the nectar of enlightenment" drip down the back of their throat. It is for this reason that there is a technique where you place the tip of your tongue as far back as possible (while rolling your eyes far back into the head), to taste the nectar. This stuff is reported to taste exactly like DMT. It's just a theory but I believe some forms of meditation can lead to the release of DMT, after many years of work. Also take into consideration the brain wave states during dreaming (which releases DMT) and meditation are very similar.