The presence of DMT in human blood and urine has been conclusively reported in a number of papers (Riceberg and van Vunakis, 1978). For many years, its presence in urine was tied to people with schizophrenia and psychosis (Jacobs and Presti, 2005). There is no question that DMT is naturally produced in the human body. The enzymes necessary to produce DMT from tryptamine and serotonin--N-methyltransferase (NMT) and indolethylamine N-methyltransferase (INMT)--as well as the mRNA necessary to produce the enzymes have been shown to exist in human tissues outside the brain.
Sensical is in fact a valid antonym for nonsense. It is a word, and you can use it. It is in the Oxford English Dictionary. It's use is traced back to 1797.
C'est Cheese: a gourmet food and cheese shop in Santa Barbara, California. Classical rhetoricians favored the important-sounding term paronomasia --playing on the sounds and meanings of words. Linguists refer to them as homophones --different words that are pronounced the same way (not weigh). And psychologists use phrases like ambiguity resolution and bistable illusion. We simply call them puns. And whether or not you're a fan of word play, puns are inescapable.