we've been having an interesting debate about this. people can get throat cancer from smoking. michael douglas, former smoker. this new report comes out and says 85% of all head and neck cancers are caught by smoking and heavy drinking. >> 100 times more likely to get throat cancer if you're a heavy smoker and drinker than not. that's staggering. plus a high risk of h.p.v. virus that's becoming more and more common. that by the way would improve his prognosis so if he gets treated with chemo and radiation and it's above the neck only and hasn't spread below, his chances are pretty good. even 80% good if he had h.p.v. virus. smoking and drinking is bad but he can do pretty well. with h.p.v., even better. i want to point out by the way, it's an incredible message of courage and hope he's coming out on tv, talking about this now. it's given a lot of hope to cancer sufferers all over the world. >> right. but how does the drinking factor into this, dr. kumer? why? >> drinking actually causes changes in your vascular system