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Whether for personal health reasons or due to potential drug testing, being aware of these patterns can help users better manage their consumption and its possible consequences. This means that a person who smokes several times over several days has consumed a higher THC dose than someone who smokes once, so they are more likely to test positive. Some 77% of heavy users and 39% of light users produced positive tests. No non-users had positive test results, suggesting that false positives in hair tests are relatively rare. A 2017 study reports on testing where hair samples from 136 cannabis users self-reporting heavy, light, or no use of cannabis. For the study, researchers cut hair into 1-centimeter sections to test for exposure up to a month prior.<\/p>\n