What are the effects of alpha-pinene and beta-pinene in cannabis?

Alpha-pinene and beta-pinene are the most abundant terpenes in nature and common in many cannabis strains. Alpha-pinene is particularly interesting pharmacologically: (1) Acetylcholinesterase inhibition: alpha-pinene inhibits the enzyme that breaks down acetylcholine, potentially counteracting THC-induced memory impairment (THC reduces acetylcholine release in the hippocampus). This has led to the hypothesis that high-pinene strains may cause less memory impairment. (2) Bronchodilation: alpha-pinene is a bronchodilator, potentially beneficial for asthma and improving cannabis inhalation efficiency. (3) Anti-inflammatory: both pinenes inhibit inflammatory mediators in preclinical models. (4) Anxiolytic: alpha-pinene shows anxiolytic effects in animal models via GABA-A modulation. (5) Antibacterial: both pinenes show activity against drug-resistant bacteria. Human clinical evidence for pinene-specific effects is absent — all evidence is preclinical. The acetylcholinesterase inhibition hypothesis for memory protection is intriguing but unproven in humans.