Where can I find information on available masters and Ph.D. programs in chemical carcinogenesis?
I would suggest starting with Amer. Assoc. for Cancer Research (AACR) meetings or website or any members forums therein.
My PhD was in the area of chemical carcinogenesis, but my actual degree came from the department in which I graduated (in this case "Biological Sciences"). You can still work in the field if your degree is in another department. It depends more on your publications in that field, IMHO. I worked in conjunction with MD Anderson Cancer Center. Thus, I would argue it's important who you pick for your thesis advisor. Obviously, it would behoove you to find an expert in the field of your study.