"your friend jamie has been smoking something in order to lose weight. jamie tells you that smoking has not only gotten her to stop snacking, but also allows her to concentrate harder when studying, especially for the next chemistry exam. at the same time, this drug relaxes her and gives her a sense of calm. she thinks you should try it out, as it might with your studying and could even you take off a couple of pounds. however, you notice jamie has an odor about her constantly, and her teeth and nails seem to be yellowing. what has jamie been smoking? "