# Household Compositions and Substance Use among Young Adults in the U.S

## TL;DR

Young adults in the U.S. who live alone or with unrelated individuals are more likely to use substances like tobacco and alcohol compared to those living with a partner and children.

## Contribution

This study identifies how household composition influences substance use patterns among young adults using U.S. national survey data.

## Key findings

- Residing solely with unrelated individuals is linked to the highest prevalence of tobacco, alcohol, and drug use.
- Living with a spouse/partner and children is associated with lower substance use prevalence.
- Household composition significantly affects substance use patterns among young adults.

## Abstract

Background: Adults aged 21–29 have the highest past-month prevalence of tobacco, alcohol, and illicit drug use in the U.S. Currently, young adults often delay traditional adulthood milestones (e.g., marriage and childbearing), which may impact their household composition and substance use. Methods: We examined how the past-month prevalence of eight mutually exclusive substance use outcomes varied by household composition among young adults using the 2016–2019 National Surveys on Drug Use and Health (NSDUH) data. Bivariable and multivariable multinomial logistic regression analyses were applied. Results: Among young adults residing with their children, the most common household composition was residing with children and a spouse/partner (16.6%, 95% CI = 16.5–16.8%). Among those residing without children, common household compositions included residing with parents (22.8%, 95% CI = 22.2–23.4%) and residing only with a spouse/partner (17.9%, 95% CI = 17.6–18.3%). Past-month prevalence of binge alcohol, tobacco, and illicit drug use varied by household composition. Residing only with children and a spouse/partner was associated with a low prevalence of most examined substance use patterns. Across household compositions, those residing solely with unrelated individuals had the highest adjusted prevalence of tobacco, drug, and binge alcohol use (13.8%, 95% CI = 12.5–15.1%). Conclusions: The prevalence of substance use patterns among U.S. young adults varies by household composition. Those residing solely with unrelated individuals had the highest prevalence of tobacco, binge alcohol, and drug use. The presence of a young adult’s own children and a spouse/partner is associated with a lower prevalence of most examined substance use patterns. As household compositions continue to diversify, targeted substance use prevention/treatment strategies may be needed.