TY  - JOUR
PY  - 2024//
TI  - Age-related changes in past-month alcohol, cannabis, and simultaneous use in a statewide sample of young adults in Washington State
JO  - Journal of studies on alcohol and drugs
A1  - Fairlie, Anne M.
A1  - Calhoun, Brian H.
A1  - Fleming, Charles
A1  - Delawalla, Miranda L. M.
A1  - Martinez, Griselda
A1  - Halvorson, Max A.
A1  - Rhew, Isaac C.
A1  - Kilmer, Jason R.
A1  - Guttmannova, Katarina
SP  - ePub
EP  - ePub
VL  - ePub
IS  - ePub
N2  - OBJECTIVE: It is unknown whether age-related decreases in substance use (maturing out) are observed in the legalized cannabis context. This study evaluated age-related changes in past-month alcohol use frequency, cannabis use frequency, and any simultaneous alcohol and marijuana/cannabis (SAM) use among young adults who engaged in the respective substance use behavior. <br><br>METHOD: Young adults, residing in Washington State at enrollment (N=6,509; 68.3% female; ages 18-25), provided 3-5 years of annual data in a longitudinal, cohort-sequential design from 2015 to 2019, a period after nonmedical cannabis was legalized and implemented. Multilevel growth models were conducted; post-stratification weights were applied to make the sample more similar to the Washington young adult general population in demographic characteristics. <br><br>RESULTS: Among those who reported alcohol use at 1+ timepoints, days of alcohol use increased from age 18 to approximately age 25 and then decreased until age 30. Among those who reported cannabis use at 1+ timepoints, days of cannabis use increased from age 18 until approximately age 23 and then decreased until age 30. Among those who reported SAM use at 1+ timepoints, the probability of SAM use increased from age 18 until approximately age 24 and then decreased until age 30. Age-related changes in SAM use were largely explained by concurrent changes in alcohol and cannabis use frequency. <br><br>CONCLUSIONS: Maturing out was observed for alcohol, cannabis, and SAM use among those who used each respective substance, with evidence that age-related changes in SAM use were tied to alcohol and cannabis use frequency.<p />  <p>Language: en</p>
LA  - en
SN  - 1937-1888
UR  - http://dx.doi.org/10.15288/jsad.24-00065
ID  - ref1
ER  -