Date of Award

Summer 2019

Degree Type


Degree Name

Doctor of Philosophy (PhD)



Committee Chair

Michael Madson

Committee Chair Department


Committee Member 2

Eric Dahlen

Committee Member 2 Department


Committee Member 3

Bonnie Nicholson

Committee Member 3 Department


Committee Member 4

Virgil Zeigler-Hill

Committee Member 4 Department



Rates of alcohol (60% monthly) and marijuana (20% monthly) use among college students remain a concern given students experience a wide range of negative consequences related to their use, especially hazardous use. Research supports the theory that protective behavioral strategies are effective strategies that one can use while engaging in alcohol and marijuana use to minimize the experience of negative consequences. However, research regarding protective behavioral strategies for marijuana is fairly new and the findings are inconsistent. Given the limited research regarding alcohol-use behaviors among college students who report alcohol and marijuana use, the purpose of this study was to examine the moderating effect of hazardous marijuana use on the relationship between hazardous alcohol consumption and alcohol-related negative consequences and on the relationship between the types of protective behavioral strategies for alcohol (e.g., manner of drinking, serious harm reduction, stopping limiting drinking) and alcohol-related negative consequences. In addition, the current study examined the moderating relationship protective behavioral strategies for marijuana has on the relationships between typical marijuana consumption and hazardous marijuana use with marijuana-related negative consequences. Participants were a national sample of 410 traditional-aged college students who completed measures of alcohol consumption, protective behavioral strategies for alcohol and marijuana, marijuana consumption, alcohol-related negative consequences, and marijuana-related negative consequences. Only hazardous marijuana use and manner of drinking emerged as significant double moderators of the association between hazardous alcohol consumption and alcohol-related negative consequences. Clinical and research implications are discussed.