dr. regina benjamin: cigarette smoke causes immediate damage that leads to health problems, even death. o quit or die are being replaced by a new generation of smokers. i'm dr. regina benjamin, united states surgeon general. go to cdc.gov. learn how to make our next generation tobacco-free. >>> once again, we return to "20/20." here's matt gutman. >> he passes this truck and nearly hit a car head-on coming up the hill right here. >> reporter: the man who played catch me if you can with the law in central america, finally got caught in central tennessee. but not for what you might think. >> put your hands on top of your head. >> reporter: john mcafee is pulled over on suspicion of driving under the influence not far from his tennessee home. >> i'm john mcafee, you probably read about me living here. >> i don't know who you are. >> really? >> i don't. >> reporter: he wasn't drunk, he says, he was high on xanax. high on xanax? how many xanax had you taken? >> well, it was what the doctor prescribed. it was a legal prescription. i'm the guy that's been accused of a murder in belize. and ran