Past research into couples' relationships has shown that substance abuse issues often increase the risk of domestic violence in the home. However, fresh-off-the-presses research shows that marijuana bucks this trend; couples who light up tend to actually experience lower rates of domestic violence. The study, which used mail-in surveys over a nine-year span, determined that marijuana use was a determining factor in lowering rates of intimate partner violence.
Experts say they are still not entirely sure why marijuana users returned lower rates of domestic violence. Fewer incidents of IPV, including hitting, choking, slapping and beating occurred each year among couples who used marijuana. That protective effect was multiplied for those couples who both tended to frequently use marijuana.