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Researchers classified individuals as heavy users if they had used cannabis more than 1,000 times during their lifetime, moderate users if they had used it between 10 and 999 times, and non-users ...
Researchers found that 63% of lifetime heavy cannabis-using participants and 68% of recent cannabis users showed reduced brain activity during their working memory task.
Developing cannabis use disorder is also a possibility when using marijuana, Kelm says. “Addiction, or cannabis use disorder, develops in about 10% of users,” he says.
A 2012 review of cannabis use and dependency in the United States by Danovitch et al said that "42% of persons over age 12 have used cannabis at least once in their lifetime, 11.5% have used within the past year, and 1.8% have met diagnostic criteria for cannabis abuse or dependence within the past year. Among individuals who have ever used ...
The research team, headed by Igor Grant, found that cannabis use affects perception but does not cause permanent brain damage. Researchers looked at data from 15 previously published controlled studies involving 704 long-term cannabis users and 484 nonusers. The results showed long-term cannabis use was only marginally harmful on memory and ...
Among cannabis users with SCD, cognitive decline was most common in people who used cannabis for medical reasons, followed by dual and recreational users. Further data analysis showed a ...
Effects have included an increase in cannabis-related calls to the Oregon state poison center, [29] an increase in perception among youth that marijuana use is harmful, [29] a decrease in arrest rates for cannabis related offenses, [29] stores sold $250 million in cannabis products which resulted in $70 million in state tax revenue (higher than ...
Scientists aren’t sure if cannabis use leads to anxiety, or if anxiety symptoms in many cannabis users are pre-existing but underdiagnosed, prompting users’ attempt to self-medicate.