david jennings is the program director of the forensic oncology labthe universi at the of california francisco. it's great 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 the whole body. >> right. cheryl, it's great to be here and thank you so much for 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 absorbed very quickly and they travel throughout the body and they wreak havoc throughout the lungs regarding cancer and also the poorly combusted smoke and the copd and the emphezema is a dominant problem and it causes peripheral 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 wonderin