Catholics are significantly less likely than the general population to have used marijuana. They're also less likely to support legalization in polls.
Cite? I don't see any reason why that would be, or any reason why any kids raised Catholic would be less likely to try pot in high school or college. I can't think of any identifying differences between kids from mostly Catholic families and kids from mostly Protestant families in my high school or college in fact.
Anyway I remember at the 2012 DFL election party as the results flashed on the screen they were mass cheers when it showed pot legalization leading in the two states (just as there were for Democratic Senate candidates leading and gay marriage.) I have a tough time visualizing that being different at an NYC Democratic party.