dr. david jennings is the program director of the forensic oncology lab at the university of california san francisco. it's grea to see you because we've been working it together for several years. i appreciate your expertise. >> for those folks that don't understand the risk of smoking, it doesn't just affect the lungs. it's body. >> right. cheryl, it's great to be here and thank you so mucfor your help and advocacy to get the word out. smoking is a total body phenomenon and you inhale it through the best drug delivery organ we have which is the multiple football field size airway space of the lung and the carcinogens are absorbe very quickly and they travel througut the body and they wreak havoc throughout the lungs regarding ncer and also the poorly combusted smoke and the copd and the emphezema is a dominant problem and it causes peipheral vascular disease. if it weren't for the nicotine buzz, nobody would do it. >> i watched this in my own family because my parents both smoked and like a lot of people i grew up in a smoking household. i can only imagine. i'm wondering if that affects p