Not your grandfather’s weed - Cannabis products and their changing potency

It serves uct quality and freshness7 were as the only source of such data in statistically significant in his anal- the United States that existed be- ysis and explained up to 43% of fore the creation of commercial the change in THC potency be- markets for medical and adult use tween 1970 and 2010.8 To be of state-legal cannabis products. [...] clear: This means the underlying potency of cannabis has increased The NCNPR data shows that significantly and that factors in the potency of DEA-seized can- addition to the raw plant's inherent nabis products has increased from THC content are also driving the 1.17% THC in 1972 to more than trend seen in the available data. [...] On the legalized cannabis for medical or adult use.15 Jakob Manthey other hand, Syed Mahamad and his colleagues recorded the explored cannabis potency in countries across the European reported THC potency for products sold by 185 legal retailers Union and found that the potency of herbal cannabis and can- and 944 illicit retailers and found that products from the illicit nabis resin had increased. [...] ElSohly, et al., Changes in Cannabis Potency over the Last Two Decades (1995-2014) - Analysis of Current Data in the United States, 79 Biological Psychiatry 613 (2016) (finding that the potency of seized cannabis products increased from 4% in 1995 to 12% in 2014); Zlatko Mehmedic, et al., Potency Trends of Δ9-THC and Other Cannabinoids in Confiscated Cannabis Preparations from 1993 to 2008, 55 For. [...] Niesink, et al., Potency trends of Δ9-tetrahydrocannabinol, cannabidiol and cannabinol in cannabis in the Netherlands: 2005– 15, 110 Addiction 1941 (2015) (finding a marginal decline in the potency of legal cannabis products in the Netherlands between 2005 and 2015); Jennifer McLaren, et al., Cannabis potency and contamination: a review of the literature, 103 Addiction 1057 (2008) (finding that ca.