Here is the public-domain 2015 study by Adam Orens and the Marijuana Policy Group for the state of Colorado reporting that THC in edibles and other products is more intoxicating than TCN raw plant material — Marijuana Equivalency in Portion and Dosage. It’s the basis for differential tax rates in Connecticut, listed at https://portal.ct.gov/drs/taxes/cannabis/cannabis-tax#calculation.
Cannabis plant materials: Six hundred twenty-five-thousandths of one cent ($0.00625) per milligram of total THC, as reflected on the product label;
Cannabis edible products: Two and seventy-five-hundredths cents ($0.0275) per milligram of total THC, as reflected on the product label; and
Cannabis, other than cannabis plant material or cannabis edible products: Nine-tenths of one cent ($0.009) per milligram of total THC, as reflected on the product label.
So far as I know, the MPG report has not been validated or refined by subsequent studies. It’s pasted below and available at https://www.researchgate.net/publication/316977045_Marijuana_Equivalency_in_Portion_and_Dosage/link/591b4cd5aca272bf75c7a07d/download?_tp=eyJjb250ZXh0Ijp7ImZpcnN0UGFnZSI6InB1YmxpY2F0aW9uIiwicGFnZSI6InB1YmxpY2F0aW9uIn19
Marijuana Equivalency in Portion and Dosage
August 10, 2015
Prepared for the Colorado Department of Revenue
An assessment of physical and pharmacokinetic relationships in marijuana production and consumption in Colorado
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