Applied Evidence

Recreational cannabinoid use: The hazards behind the “high”

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Use linked to car accidents. More recent work indicates cannabis use is associated with injuries in motor vehicle,32 non-traffic,33 and workplace34 settings. In fact, a meta-analysis found a near-doubling of motor vehicle accidents with recent use.32 Risk is dose-dependent and heightened with alcohol.35-37 Psychomotor impairment persists for at least 6 hours after smoking cannabis,38 at least 10 hours after ingesting it,37 and may last up to 24 hours, as indicated by a study involving pilots using a flight simulator.39

Cannabis contains at least 33 carcinogens and may be contaminated with pesticides.In contrast to alcohol, there is a greater decrement in routine vs complex driving tasks in experimental studies.35,36 Behavioral strategies, like driving slowly, are employed to compensate for impairment, but the ability to do so is lost with alcohol co-ingestion.35 Importantly, individuals using marijuana may not recognize the presence or extent of the impairment they are experiencing,37,39 placing themselves and others in danger.

Data are insufficient to ascribe to marijuana an increase in overall mortality,40 and there have been no reported overdose deaths from respiratory depression. However, a few deaths and a greater number of hospitalizations, due mainly to central nervous system effects including agitation, depression, coma, delirium, and toxic psychosis, have been attributed to the use of synthetic cannabinoids.20

Cannabis use can pose a risk to the fetus. About 5% of pregnant women report recent marijuana use2 for recreational or medical reasons (eg, morning sickness), and there is concern about its effects on the developing fetus. Certain rare pediatric cancers22,25 and birth defects41 have been reported with cannabis use (TABLE 222,25,41,42). Neonatal withdrawal is minor, if present at all.42 Moderate evidence indicates prenatal and breastfeeding exposure can result in multiple developmental problems, as well as an increased likelihood of initiating tobacco and marijuana use as teens.41,42

Outcomes associated with cannabis use during pregnancy and/or breastfeeding image

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