Predictors of changes in marijuana consumption in Germany during the covid-19 pandemic

During the Covid-19 pandemic Germany experienced its first increase in the proportion of heavy cannabis users since 1995. With the expected nationwide decriminalization of cannabis before 2025, we investigate the potential causes for that increase. Data were from the 2021 European Web Survey on Drugs (EWSD) including 762 12-month marijuana users from Germany (72.9% male, mean age = 29.5 years). Both heavy and regular cannabis consumers reported an increase in marijuana consumption during the pandemic, with infrequent users reporting a decrease. Using multinomial logistic regression, we found younger individuals (OR = 0.95 [95% CI = 0.92, 0.98]) and those not pursuing or completing higher education (OR = 1.86 [1.23, 2.81]) had increased use. Additionally, using cannabis to self-medicate (OR = 2.79 [1.56, 4.99]) and purchasing marijuana (OR = 2.26 [1.35, 3.77]) was associated with increased use. We found, relative to infrequent users, both regular (OR = 4.00 [2.39, 6.72]) and notably heavy users (OR = 31.17 [12.10, 80.32]) were more likely to use cannabis to self-medicate. Both regular (OR = 4.09 [2.47, 6.77]) and especially heavy users (OR = 13.53 [6.74, 27.16]) were also more likely to purchase marijuana. Heavy users were also more likely to be past 30-day tobacco users (OR = 5.92 [2.81, 12.45]). We identified the self-reported motivation of using cannabis to self-medicate as well as act of purchasing marijuana as having the strongest relation to being a heavy user and increasing marijuana use during the Covid-19 pandemic.