Question: Is there a problem of Chometz with Smoking on Pesach?

Answer: 
See here even the Mishnah Berurah disallows tabaco
[PDF of Chometz and Smokiing](http://www.shtaygen.net/horadot/psach/aishun.pdf)
Just about any food, personal care, or medical product is required to reveal far more about its formulation than cigarettes do. So it's incredibly hard to tell what they're putting in there.