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Under the typical 50 ng/mL cutoff used for cannabis testing in the United States, an occasional or on-off user would be very unlikely to test positive beyond 3–4 days since the last use, and a chronic user would be unlikely to test positive much beyond 7 days.
Cannabis. Two main questions arise in the law surrounding driving after having ingested cannabis: (1) whether cannabis actually impairs driving ability, and (2) whether the common practice of testing for THC (the main psychoactive substance in cannabis) is a reliable means to measure impairment. On the first question, studies are mixed.
Researchers found that more days of use were correlated with decreases in inhibitory control, and visuospatial ability. Contrary to existing cross-sectional studies showing marijuana use in adolescence is associated with poor cognitive functioning, there were no associations between long-term cannabis use and memory and processing speed. [55]
A cloud of marijuana smoke rises as a clock hits 4:20 p.m. during the Mile High 420 Festival in Denver on "weed day" in 2022. - Patrick T. Fallon/AFP/Getty Images/File
The risk climbed as the number of days of use of marijuana rose. “Cannabis smoke is not all that different from tobacco smoke, except for the psychoactive drug: THC (tetrahydrocannabinol) vs ...
In 2022, an estimated 17.7 million people reported using marijuana daily or near-daily compared to 14.7 million daily or near-daily drinkers, according an analysis of national survey data. In 1992 ...
Occupational health concerns over the use of cannabis among workers are becoming increasingly important as cannabis becomes legal in more areas of the US. [1] [2] [1] Of note, employers have concerns of workers either coming to work acutely impaired or recent use of cannabis still being detected in the body. Employment issues such as ADA law as ...
In day-to-day practice, a history of marijuana use is often not sought by many practitioners, and even when sought, the patient's response is not always truthful". [75] A 2013 analysis of 3,886 myocardial infarction survivors over an 18-year period showed "no statistically significant association between marijuana use and mortality". [76]