Is smoking heaviness causally associated with alcohol use? A Mendelian randomization study in four European cohorts

Michelle Taylor^*, Line Rode, Johan Bjørngaard, Amy E. Taylor, Stig E. Bojesen, Bjørn O. Åsvold, Maiken E. Gabrielsen, Glyn Lewis, Børge G. Nordestgaard, Pal R. Romundstad, Matthew Hickman, Marcus R. Munafò

^*Corresponding author for this work