Simultaneous use of alcohol and marijuana is riskier than using either substance alone, because their effects can interact and cause excessive depression of the central nervous system. This can result in more negative consequences such as driving under the influence, accidents, cognitive impairment, and symptoms of substance use disorders, as well as alterations in mood and well-being.
There has been little research on simultaneous alcohol and marijuana use among college students following legal changes regarding medical and recreational marijuana use in some states. A new study has evaluated patterns of simultaneous substance use among students in three state universities with different state laws on recreational marijuana use.
The study involved 1400 students who had used both alcohol and marijuana (alone and/or together) in the past year, and who completed an online survey assessing their own substance use and negative consequences, perceptions of simultaneous alcohol and marijuana use among peers and close friends, and ease of access to marijuana.
Overall, three-fourths of participants reported having used alcohol and marijuana simultaneously in the past year, on average twice per month. After controlling for overall