People with Certain Personality Traits are Less Likely to Mature Out of Hazardous Substance Use, Study Suggests

The typical rise and fall of alcohol and cannabis consumption from late adolescence into adulthood does not hold for people with certain personality traits, a new study suggests. Among individuals who used both alcohol and cannabis, those with high impulsivity as adolescents showed a different developmental trajectory from their peers, according to a study in Alcoholism: Clinical & Experimental Research — the first to assess co-use of the two substances well into adulthood. Alcohol and cannabis are the two most frequently used psychotropic drugs in the US. High use is associated with negative health outcomes, particularly when the two substances are used concurrently or simultaneously. Little is known about the developmental course of alcohol and cannabis co-use into adulthood and whether it is influenced by sensation seeking and reduced conscientiousness, markers of disinhibition associated with hazardous substance use. Researchers at Arizona State University explored whether those pe