To be fair, abortion should not be considered only "vice." Unlike abortion, drugs, smoking, drinking, prostitution, only harms the person seeking it; abortion is the taking of another human life, period. It can be reasonably argued that a person has the right to destroy their own life, but that right is not extended to destroying the life of another.
A fair point. I have no problems banning abortion since nobody has the right to harm another, even if that other person happens to be inside of you.