Outlast

Drinking during adolescence and youth can alter impulse control and lower inhibitions.^{1, 2}
Weed and alcohol can make it more difficult to remember.^{1, 3, 4}
Using substances like weed and alcohol make it hard to focus.^{1,
5}
Using cannabis results in short-term memory loss.¹
Underage drinking increases the risk of memory problems.⁴
Using alcohol as a teen can permanently damage your brain^{6, 7, 8}
Using cannabis can permanently alter how teen brains work.^{9, 10}
Smoking weed regularly can damage the hippocampus, the memory center of the brain, preventing you from making the memory.^{11, 12}
Just smoking weed occasionally can change the brains of teens.¹³
Alcohol affects the cerebral cortex, the part of the brain responsible for your process of thinking and self-control. ^14,15
Drinking as a teen can lead to less gray matter in the hippocampus and a smaller amygdala. ¹⁶

¹Volkow, N. D., Baler, R. D., Compton, W. M., & Weiss, S. R. (2014). Adverse health effects of marijuana use. New England Journal of Medicine, 370(23), 2219-2227.
²López-Caneda, E., Rodríguez Holguín, S., Cadaveira, F., Corral, M., & Doallo, S. (2013). Impact of alcohol use on inhibitory control (and vice versa) during adolescence and young adulthood: a review. Alcohol and alcoholism, 49(2), 173-181.
³Wetherill, R. R., & Fromme, K. (2016). Alcohol-Induced Blackouts: A Review of Recent Clinical Research with Practical Implications and Recommendations for Future Studies. Alcoholism: Clinical & Experimental Research, 40(5), 922-935. doi:10.1111/acer.13051
⁴Centers for Disease Control and Prevention (CDC). (2017). Alcohol and public health, CDC, Atlanta, GA. Retrieved 11 September 2018 from https://www.cdc.gov/alcohol/fact-sheets/alcohol-use.htm
⁵Field, M., Wiers, R. W., Christiansen, P., Fillmore, M. T., & Verster, J. C. (2010). Acute Alcohol Effects on Inhibitory Control and Implicit Cognition: Implications for Loss of Control Over Drinking. Alcoholism, Clinical and Experimental Research, 34(8), 1346–1352. http://doi.org/10.1111/j.1530-0277.2010.01218.
⁶Paturel A. The Effects of Drinking on the Teenage Brain. Brainandlife.org. https://www.brainandlife.org/articles/how-does-alcohol-affect-the-teenage-brain/. Published 2012. Accessed September 9, 2020.
⁷Miguel-Hidalgo JJ. Brain structural and functional changes in adolescents with psychiatric disorders. Int J Adolesc Med Health. 2013;25(3):245-256. doi:10.1515/ijamh-2013-0058
⁸Squeglia LM, Jacobus J, Tapert SF. The effect of alcohol use on human adolescent brain structures and systems. Handb Clin Neurol. 2014;125:501-510. doi:10.1016/B978-0-444-62619-6.00028-8
⁹Catherine Orr, Philip Spechler, Zhipeng Cao, etal. Grey Matter Volume Differences Associated with Extremely Low Levels of Cannabis Use in Adolescence. Journal of Neuroscience 6 March 2019, 39 (10) 1817-1827; DOI: 10.1523/JNEUROSCI.3375-17.2018
¹⁰NIDA. What are marijuana's long-term effects on the brain?. National Institute on Drug Abuse website. https://www.drugabuse.gov/publications/research-reports/marijuana/what-are-marijuanas-long-term-effects-brain. April 8, 2020.
¹¹Northwestern University. (2015, March 12). Teen cannabis users have poor long-term memory in adulthood. ScienceDaily. Retrieved September 9, 2020 from www.sciencedaily.com/releases/2015/03/150312082906.htm
¹²Wallis C. Marijuana and the Teen Brain. Scientific American. https://www.scientificamerican.com/article/what-pot-really-does-to-the-teen-brain/. Published 2017. Accessed September 9, 2020.
¹³Charles S. Just a little weed may change teen brain, study finds. NBC News. https://www.nbcnews.com/storyline/legal-pot/even-little-marijuana-may-change-teen-brain-study-finds-n958536. Published 2019. Accessed September 9, 2020.
¹⁴Squeglia, L. M., Jacobus, J., & Tapert, S. F. (2014). The effect of alcohol use on human adolescent brain structures and systems. Handbook of Clinical Neurology, 125, 501-510. https://doi.org/10.1016/B978-0-444-62619-6.00028-8
¹⁵Paturel, A. (2012, January). The effects of drinking on the teenage brain. Brain & Life. https://www.brainandlife.org/articles/how-does-alcohol-affect-the-teenage-brain/
¹⁶Elofson, J., Gongvatana, W., & Carey, K. B. (2013). Alcohol use and cerebral white matter compromise in adolescence. Addictive Behaviors, 38(7), 2295–2305. https://doi.org/10.1016/j.addbeh.2013.03.001