Well ... tobacco companies give millions of dollars to politicians campaign coffers. They also employ many thousands of people. That will never become illegal.
Seat belts on the other hand have a dual purpose. Insurance companies lobbied for the legislation plus the real zinger is .... it generates revenue for local municipalities by police giving out tickets. The tickets aren't cheap here in NY either. I think $50 the first time.
Cell phone usage while driving is next for most areas. We have it here . I think that is $100 for the first time and $250 for the second offense.