The first-of-its-kind meta-analysis synthesized the results of 80 different scientific research.
"Our analysis indicates that impairment may last up to ten hours if high doses of THC are consumed orally. A more typical duration of impairment, however, is four hours, when lower doses of THC are consumed via smoking or vaporization and simpler tasks are undertaken ," said McCartney.
“This impairment may extend up to six or seven hours if higher doses of THC are inhaled and complex tasks, such as driving, are assessed.”The moderate THC dose for this study was set at around 10 milligrams, but the experts also stated what is moderate for a frequent user may be high for a casual user."We found that impairment is much more predictable in occasional cannabis users than regular cannabis users.
THC taken in the form of oils, sprays, or capsules, which is the forms used in the medicinal use of cannabis, causes the impairment to take longer to appear and lasts significantly longer than with inhaling. "THC can be detected in the body weeks after cannabis consumption while it is clear that impairment lasts for a much shorter period of time. Our legal frameworks probably need to catch up with that and, as with alcohol, focus on the interval when users are more of a risk to themselves and others. Prosecution solely on the basis of the presence of THC in blood or saliva is manifestly unjust," said Professor Iain McGregor, the Academic Director of the Lambert Initiative.
"Laws should be about safety on the roads, not arbitrary punishment. Given that cannabis is legal in an increasing number of jurisdictions, we need an evidence-based approach to drug-driving laws."The increasing legal availability of cannabis has important implications for road safety. This systematic review characterized the acute effects of Δ9-THC on driving performance and driving-related cognitive skills, with a particular focus on the duration of Δ9-THC-induced impairment.
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