Cannabis and Potency: Peer-Reviewed Research Consensus

Where THC acts in the brain depends on dose and how many cannabinoid receptors are present

Identifying where THC acts most strongly in the brain, and why, helps explain the wide range of cognitive effects reported by cannabis users and could inform dosing strategies for therapeutic applications.

Alpha-Pinene Does Not Counteract THC-Induced Memory Impairment in Humans

This rigorous trial found no evidence for one of the most commonly cited entourage effect claims.

Blood and oral fluid cannabinoid levels varied widely between frequent and occasional cannabis smokers

Several states have adopted per se THC driving limits, but this study shows these limits perform poorly at identifying recent use, especially in frequent users who may test positive without having used recently. This has direct implications for roadside testing fairness.

Oral cannabis at 25-50 mg THC markedly impaired cognition in infrequent users, with delayed onset and peak effects

Edibles are a growing market segment, but their delayed onset leads to overconsumption. This controlled study quantifies the dose-response and time course, providing the evidence base for edible dosing guidelines and consumer education.

Cannabis edibles produced delayed, lower blood THC peaks than smoking, with women showing higher concentrations

This is one of the few controlled studies with both sexes examining oral cannabis pharmacokinetics. The sex differences (higher THC in women) and oral fluid findings (immediate detection not reflecting blood levels) have direct implications for drug testing interpretation.

Low-dose CBD enhanced THC intoxication while high-dose CBD reduced it, especially in infrequent users

This fundamentally challenges the simple narrative that "CBD counteracts THC." The dose matters enormously, and low-dose CBD (the ratio found in many commercial products) may actually make THC more intoxicating.