R code for publication on substance use during first COVID

## Project: Alcohol and COVID-19 in Europe ## Title: Use of alcohol, tobacco, cannabis, and other substances during the first wave of the SARS-CoV-2 pandemic in Europe: A survey on 36,000 European substance users ## Author: Jakob Manthey & Sinclair Carr Analysing survey data to describe changes in substance use during the first wave of the COVID-19 pandemic.