The incredible variety of DMT extraction routes, skills/knowledge of person extracting, and purity of chemicals will likewise be reflected in the varied purity of between different batches of DMT. That is one of the reasons why buying DMT or getting it from an unknown untrustable person is very dangerous! One could be smoking toxic solvent left overs or other impurities from chemicals used. We strongly advice that if one is going to ingest/smoke DMT, that they should only do it with DMT they extracted themselves and took special care with purity (for example using guaranteed pure chemicals, doing a solvent evaporating test, making sure the product has been thoroughly dried, etc) or of a known person that did the same.
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this thread there are some guideliness for knowing if your DMT is ok to smoke