That's an interesting thought, but i don't believe that to be the case with my political beliefs as I held them long before partaking of either nicotine or alcohol. I don't believe that the correlation is sound in my case.
I did notice than when the legalisation of cannabis was discussed somewhat heatedly in this forum, the main protagonists supporting it were well known strongly left leaning forum members, so the idea certainly has some merit. Who knows...? Degree course?
Could well be. Degrees generally encourage critical analysis and being able to look beyond a single set of interests, something which doesn't align with certain political beliefs.