How consistent and reliable is medical cannabis from dispensaries?
Research-Based Answer
Cannabis product quality and consistency from dispensaries varies enormously and represents a significant clinical challenge. Key issues: (1) Label accuracy: A 2015 JAMA study (Vandrey et al.) tested 75 dispensary products and found only 17% were accurately labeled for CBD content; 23% were overlabeled (more THC than stated), 60% underlabeled. (2) Pesticide contamination: A 2017 study found 84% of California dispensary samples contained pesticide residues; 12% exceeded safety thresholds. (3) Microbial contamination: Immunocompromised patients (cancer, HIV) face risk from mold and bacteria in cannabis — Aspergillus contamination has caused fatal infections. (4) Batch-to-batch variability: Even from the same producer, cannabinoid profiles vary significantly. (5) Terpene degradation: Improper storage degrades terpenes, altering effects. Recommendations: choose products with third-party Certificates of Analysis (COA), prefer licensed dispensaries in regulated markets, and avoid vape cartridges from unverified sources.
This answer summarizes peer-reviewed research and is intended for educational purposes only. It does not constitute medical advice. Consult a qualified healthcare provider before making any medical decisions.