Washington: A new study from the University of Tennessee, Knoxville has suggested that alcohol use is more likely to lead to violence between partners than marijuana.
Research among college students found that men under the influence of alcohol are more likely to perpetrate physical, psychological or sexual aggression against their partners than men under the influence of marijuana.
Women, on the other hand, were more likely to be physically and psychologically aggressive under the influence of alcohol but, unlike men, they were also more likely to be psychologically aggressive under the influence of marijuana.
The research has implications for domestic violence intervention and prevention programs.
The studies were conducted by Ryan Shorey, a psychology doctoral student; Gregory Stuart, a psychology professor; Todd Moore, an associate psychology professor; and James McNulty, an associate professor of social psychology at Florida State University.
The researchers' goal was to find correlations between alcohol and marijuana use and the potential for physical, psychological and sexual violence against partners.
The studies are among the first to investigate the timing of alcohol and marijuana use and intimate partner violence in college students.
Two studies included male and female college students who were at least 18 years old, had been a relationship for at least a month that involved two days a week of face-to-face contact, and had consumed alcohol in the previous month. The subjects completed an online diary once a day for 90 days.
The study of men found that odds of psychological, physical and sexual violence increased with subsequent use of alcohol. Specifically, odds of physical and sexual abuse increased on days where any alcohol was consumed and with each drink consumed. Odds of psychological abuse increased only on days when five or more drinks were consumed.
Marijuana use was unrelated to violence between intimate partners.
The study of college women found that alcohol use increased the odds of physical and psychological aggression while marijuana use increased the odds of psychological aggression.
The study of male participants is published in the journal Addictive Behaviors and the study of female participants is published in the journal Psychology of Addictive Behaviors.