which psychedelic substances Canadians use/buy the most

If you mean which psychedelic substances Canadians use/buy the most, the clearest answer is psilocybin (magic mushrooms).

Current Canadian data points to this rough picture:

Psilocybin — by far the leading psychedelic. In the Canadian Psychedelic Survey, 92.3% of respondents who used psychedelics had used psilocybin at some point, and 59.1% had used it in the previous year.

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LSD — one of the next most commonly used psychedelics; about one-quarter of the survey sample reported past-year use.

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MDMA/ecstasy — also very common among people who use psychedelics, with lifetime use exceeding 60% and past-year use around one-quarter in that survey.

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DMT, ayahuasca, mescaline and ibogaine — substantially smaller niches. Ibogaine was particularly uncommon, with only 2.3% reporting lifetime use in the survey.

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There is also evidence that psilocybin products dominate the retail side. A 2024 study of Canadian psychedelic dispensaries found that all identified stores sold dried mushrooms, while 97.8% sold microdosing capsules, 91.3% sold psilocybin chocolate, and 93.4% sold gummies.

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One important caveat: psilocybin remains a controlled substance in Canada outside authorized exemptions, so “what people buy” isn’t the same as a legal consumer market. Health Canada’s 2023 survey found psychedelics were the most commonly used category of illegal drugs, with 6% of Canadians reporting past-year use.

If you’re asking this from a market-research/business perspective, I can also break down which psychedelic formats Canadians appear to prefer (dried mushrooms vs. gummies vs. chocolates vs. microdose capsules), demographics, and provinces/cities with the strongest demand.