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Researchers analyze THC in breath of cannabis smokers

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Researchers analyzed THC levels in the breath of people who use cannabis regularly, both before and after they smoked marijuana. The researchers found that THC levels spanned a similar range across pre- and post-use samples. ‘In many cases, we would not have been able to tell whether the person smoked within the last hour based on the concentration of THC in their breath,’ said study author.

Source: ScienceDaily.com