The West of Scotland has traditionally been a focus for Irish migratio
n. Using data from two studies carried out in this region, one quantit
ative, the other qualitative, this paper shows little difference in dr
inking and smoking between Scots of Irish descent and other Scots. It
does, however, show significant differences in these behaviours accord
ing to religious affiliation in adulthood. Rather than confirming the
stereotype of Irish Catholics as heavy drinkers and smokers the presen
t paper puts forward the hypothesis that drinkers and smokers are diff
erentially retained in membership by different religious affiliations,
and argues that this accounts for differences in reputation and in he
alth-related behaviours.