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.
In the philosophy of language the term colloquial language refers to ordinary natural language, as distinct from specialized forms used in logic or other areas of philosophy. In the field of logical atomism, meaning is evaluated in a different way than with more formal propositions.