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INTRODUCTION AND AIMS: There is little objective market data on the price or potency of legal and illegal cannabis products following recreational cannabis legalisation. DESIGN AND METHODS: In the 2 months post-legalisation in Canada (November-December 2018), legal and illegal cannabis retailers were identified from government lists and online directories. The store location, price and Δ9-tetrahydrocannabinol (THC) and cannabidiol levels of dried herb and cannabis cookies were collected from retailer websites or Weedmaps. RESULTS: We identified 185 legal retailers (22 online stores, 163 storefronts; 65 government-run stores, 120 private stores) and 944 illegal retailers (791 delivery-only services, 157 storefronts). Relative to legal dried herb, illegal dried herb was lower in price (1 g: 10. 23 vs. 11. 08, ⅛ oz: 9. 37/g vs. 10. 88/g, ½ oz: 8. 18/g vs. 8. 85/g; P < 0. 05 for all) and higher in potency (THC: 20. 5% vs. 16. 1%, cannabidiol: 2. 4% vs. 1. 7%; P < 0. 05 for both). Legal private stores had higher prices for dried herb than government-run stores (1 g: 13. 08 vs. 10. 89, ⅛ oz: 12. 75/g vs. 10. 45/g, ½ oz: 10. 85/g vs. 8. 71/g, 1 oz: 8. 54/g vs. 7. 22/g; P < 0. 05 for all). On average, one cannabis cookie in the illegal market contained 96 mg of THC and cost 1. 57 per 10 mg of THC. DISCUSSION AND CONCLUSIONS: In the 2 months post-legalisation, illegal cannabis was less expensive, with higher labelled THC content than legal cannabis, although the scope of these differences was more modest than estimates from other crowdsourced and self-reported data. Direct monitoring of cannabis price and potency from legal and illegal retailers is needed to examine the impact of legalisation over time.
Mahamad et al. (Tue,) studied this question.