Yes: > Overall, the potency of illicit cannabis plant material has consistently risen over time since 1995 from approximately 4% in 1995 to approximately 12% i

Yes: > Overall, the potency of illicit cannabis plant material has consistently risen over time since 1995 from approximately 4% in 1995 to approximately 12% in 2014. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4987131/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4987131/