1. The current BLS weights for Education is 3.033%, for Tobacco and smoking products 0.608%, that's 20%, not >50% [1].

2. There are around 20mln Americans in college, versus around 34mln adult smokers. Be careful about peer-group bias: how many of your friends smoke, how many went to college?

[1] https://www.bls.gov/cpi/tables/relative-importance/2020.htm