A cannabis testing facility in California analyzed 18 cartridges containing THC, the active ingredient in marijuana, from both legal dispensaries and unlicensed dealers, NBC News reports.
No heavy metals, pesticides or solvents such as vitamin E were found in the legal products.
But all 10 of the black market cartridges tested positive for pesticides and myclobutanil, a fungicide that can transform into hydrogen cyanide when burned, the analysis found.
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