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.
a concise explanation of the company's retirement plan. pithy, compendious, laconic. Concise, succinct, terse all refer to speech or writing that uses few words to say much. Concise usually implies that unnecessary details or verbiage have been eliminated from a more wordy statement: a concise summary of the speech. Succinct, on the other hand, implies that the message is as originally composed and is expressed in as few words as possible: a succinct statement of the problem.