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Comment by Hasknewbie | Hacker News Reader

A recent study here in Europe as found that some low-quality CBD e-liquids contain traces of solvent (used to extract said CBD) that are above safety level and may trigger adverse reaction in vapers. I assume THC e-liquid goes through the same sort of process and may have the same issue.

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Yes, residual solvents are possible with the THC extraction process. I prefer to use THC concentrates extracted with CO2 to avoid inhaling residual solvents.

Can you tell only CO2 was used?

Co2 iirc is a physical extraction, like bubble hash, while this is concerning solvent hash, a different product.

The correct way to extract solvents is under vacuum.

Supercritical CO2 is a (very non-polar) solvent. I can't imagine what would make that a physical or mechanical extraction.

Good CO2 extraction uses two passes at different pressures. One to extract the terpenes and one for the cannibinoids.

I would love it if you had a link to that study. A relative of mine is on the lookout for CBD oils and I said I'd help find what there is.

I don't have a direct link to the study, but this is from the BBC (https://www.bbc.com/news/health-48950483):

"The researchers also found the presence in seven products of the solvent dichloromethane, which can cause wheezing and shortness of breath, at levels above food safety limits."

Are food safety limits the appropriate limit for something that will be largely exhaled?

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