As people's metabolism are different and then concentrations of toxins vary from mushroom to mushroom, there is no way of predicting what one's reactions will be. Some people experience extreme discomfort, others vivid dreams, still others experience no effects whatsoever. The ingestion of these mushrooms is definately not recommended. Not all toxins have been identified, so others present scould be deadly to some. R.G. Wasson presented a very detailed account of his findings, tracing all descriptions of Soma, and concluded that Soma was a mushroom and specifically, Amanita muscara, the fly agaric.
Soma is one of the few entheogens that is looked upon as a god rather than a sacred mediator.