Although I mainly am familiar with the vagaries of Trichocereus cacti, from this study I know that alkaloidal profile can vary between plants of the same species.Even the same plant during different times of day.

Also if one is analyzing a sample of an alkaloid and it is as you say white spice it has been selectively xtalized for DMT.It is the less pure samples which need investigated,also several extractions of the same material, using solvents ranging in polarity and pH of different ranges to really know if there is another extractable alkaloid or an active "artifact" in crude extracts. That this controversy exists over Mimosa and not Psychotria or the common wattles of OZ is yet another clue. Of course another factor is personal biochemistry relating to spice metabolism. I know of no studies which have investigated the vagaries of personal biochemistry in the ingestion of spice vapor. This alone could explain the differences in reaction to byproducts in Mimosa, like tannins. I do not claim proof ,just the very high likelihood of active secondary products in crude extracts of Mimosa given the wide variety of effects produced from extractions of supposedly the same species.

PS;

Crude Extract: first pass xtals freeze precipitated and washed with ammonia then dried.

White spice: crude extract recrystallized from naphtha or heptane to pure white crystalline powder