Study: No Increase In Problematic Cannabis Use Following Passage Of Medical Marijuana Laws

no_marijuanaThe enactment of medical marijuana laws is not associated with increased rates of problematic cannabis use, according to data published online in the journal Addiction.

Columbia University investigators assessed cannabis use trends in states in the years following the passage of medicalization. They reported “no significant change in the prevalence of past-month marijuana use among adolescents or young adults (those ages 18 to 25)” following legalization. They also found no evidence of increased cannabis abuse or dependence by either young people or adults. States with largely unregulated medical programs were associated with increased self-reported use by adults age 26 and older, but states with stricter programs were not.

The study’s findings are consistent with those of numerous other papers reporting no uptick in youth marijuana use or abuse following medical marijuana regulation, including those here, here, here, here, here, and here. The findings contradict those of a recent, widely publicized paper in JAMA Psychiatry which speculated that medical marijuana laws may increase the prevalence of cannabis use disorder among adults.

An abstract of the study, “Loose regulation of medical marijuana programs associated with higher rates of adult marijuana use but not cannabis use disorder,” is online here.

Study: Medical Marijuana Laws Associated With Fewer Traffic Fatalities

cropsThe passage of medical marijuana legalization is associated with reduced traffic fatalities among younger drivers, according to data published online ahead of print in the American Journal of Public Health.

Investigators from Columbia University in New York and the University of California at Davis analyzed traffic fatality data from the years 1985 to 2014.

They reported that states with medical cannabis laws had lower overall traffic fatality rates compared to states where cannabis is illegal, and that there was an immediate decline in motor vehicle deaths following the establishment of a legal cannabis market – particularly among those under 44 years of age.

Authors concluded: “[O]n average, MMLs (medical marijuana laws) states had lower traffic fatality rates than non-MML states. …. MMLs are associated with reductions in traffic fatalities, particularly pronounced among those aged 25 to 44 years. … It is possible that this is related to lower alcohol-impaired driving behavior in MML-states.”

An abstract of the study, “US traffic fatalities, 1985-2014, and their relationship to medical marijuana laws,” appears online here.

Study: Marijuana Retailers Not Selling To Youth

mj_salesAge restrictions in legal marijuana states are effectively keeping cannabis out of the hands of minors, according to newly published data in the Journal of Studies of Alcohol and Drugs.

A team of investigators from California, Colorado, and New Mexico assessed whether licensed retail cannabis facilities would sell to pseudo-underage buyers who failed to show proof of age.

Authors reported, “Compliance with laws restricting marijuana sales to individuals age 21 years or older with a valid ID was extremely high and possibly higher than compliance with restrictions on alcohol sales.”

They concluded, “The retail market at present may not be a direct source of marijuana for underage individuals.”

Similar assessments of facilities in other jurisdictions have also shown that the overwhelming majority of marijuana retailers refuse sales to apparent minors.

A pair of studies published earlier this week from Columbia University researchers reported that changes in marijuana’s legal status are “not associated with higher prevalence rates of marijuana use among adolescents.”

An abstract of the study, “Pseudo-Underage Assessment of Compliance With Identification Regulations at Retail Marijuana Outlets in Colorado,” appears here.

Studies: Changes In Marijuana’s Legal Status Not Associated With Increased Use By Young People

no_marijuanaChanges in marijuana’s legal status under state law is not associated with increased cannabis use or with its perceived availability by young people, according to pair of recently published studies.

In the first study, published online in the journal Substance Use & Misuse, researchers at Columbia University in New York surveyed the marijuana use habits of a national sampling of 1,310 adolescents between the years 2013 and 2015. Investigators assessed whether respondents from states with liberalized cannabis policies were more likely to acknowledge having consumed cannabis compared to those residing in jurisdictions where the substance remains criminally prohibited.

Authors reported that the study’s findings “failed to show a relationship between adolescentsuse of marijuana and state laws regarding marijuana use.” … [They] suggest that eased sanctions on adult marijuana use are not associated with higher prevalence rates of marijuana use among adolescents.”

In the second study, published in the journal Drug and Alcohol Dependence, a team of investigators from Columbia University, the University of California at Davis, and Boston University examined the relationship between medical cannabis laws and the prevalence of marijuana availability and use by both adolescents and by those age 26 or older. Authors reported no changes over a nine-year period (2004 to 2013) with regard to the past-month prevalence of marijuana use by those ages 12 to 17 or by those between the ages of 18 and 25. Those age 25 and younger also experienced no change in their perception of marijuana’s availability. By contrast, self-reported marijuana use and availability increased among adults age 26 or older over this same time period.

The conclusions are similar to those of numerous separate studies reporting that changes in marijuana’s legal status are not associated with any uptick in teens’ use of the substance, such as those here, here, here, and here.

Abstracts of the two studies, “Is the Legalization of Marijuana Associated With Its Use by Adolescents?” and “State-level medical marijuana laws, marijuana use and perceived availability of marijuana among the general U.S. population,” appear online here and here.

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