Changes in substance use among young adults during a respiratory disease pandemic

Background: News articles, commentaries, and opinion articles have suggested that ongoing social distancing measures coupled with economic challenges during COVID-19 may worsen stress, affective state, and substance use across the globe. We sought to advance our understanding of the differences between individuals who change their substance use patterns during a public health crisis and those who do not. Methods: Cross-sectional survey of young adults (18-25 years of age) assessing respondent characteristics and vaping, tobacco, alcohol, and/or marijuana use. We calculated prevalence estimates, prevalence changes, and prevalence ratios with associated 95% confidence intervals and looked for differences with the chi-square test. Results: Of the total sample, 53.2% (n = 542/1018) young adults reported vaping or using tobacco, alcohol, and/or marijuana. Among the 542 respondents reporting use, 34.3% reported a change in their use patterns. Among respondents reporting changes in substance use patterns during the pandemic (n = 186), 68.8% reported an increase in alcohol use, 44.0% reported a decrease in vaping product use, and 47.3% reported a decrease in tobacco product use due to COVID-19. Substance use changed significantly for respondents with increasing degree of loneliness (continuous loneliness score: prevalence ratio = 1.12, 95% confidence interval = 1.01-1.25), anxiety (prevalence ratio = 1.45, 95% confidence interval = 1.14-1.85), and depression (prevalence ratio = 1.44, 95% confidence interval = 1.13-1.82). Conclusion: Self-reported substance use among young adults was observed to change during a pandemic, and the degree of loneliness appears to impact these changes. Innovative strategies are needed to address loneliness, anxiety, depression, and substance use during global health crises that impact social contact.