Health Canada launched the Cannabis Data Gathering Program in 2023 to analyze the quality and safety of cannabis products in Canada. The goal is to assess potential health risks, identify contamination levels, and compare legal and illegal cannabis products. The findings aim to improve regulatory policies and consumer awareness.
Key differences in THC levels
One of the main findings was the discrepancy in THC levels. Legal products often had lower THC levels than labeled, with 48% containing less than 80% of the stated amount. Illegal products, which lacked labeling, varied widely in potency, ranging from less than 100 mg/g to over 250 mg/g. This highlights inconsistencies in legal product labeling and the unpredictability of illegal products.
Contaminants and health risks
The study examined heavy metals, mycotoxins, pesticides, and microbial contamination. While legal cannabis generally met safety standards, some illegal products contained harmful substances:
- Heavy metals – One illegal sample exceeded safe arsenic levels, and other metals like nickel and molybdenum were detected at concerning levels.
- Mycotoxins – Present in 12% of illegal products but absent in legal ones, posing risks to human health.
- Pesticides – Found in 94% of illegal samples, with multiple residues per product, some at dangerous levels. Legal cannabis had only trace amounts in a few samples.
- Microbial contamination – Illegal cannabis showed significantly higher contamination, including harmful bacteria like Klebsiella and Pseudomonas aeruginosa, which can cause infections.
What does this mean for consumers?
The findings reinforce the benefits of purchasing from legal sources. While legal cannabis showed some THC mislabeling, it was largely free from dangerous contaminants. Illegal products, however, carried substantial health risks due to contamination and unpredictable potency. Ongoing monitoring will help refine regulations and improve consumer safety.