This randomized early phase I trial studies how well broccoli sprout/broccoli seed extract
supplement works in decreasing toxicity in heavy smokers. Broccoli sprout/broccoli seed
extract supplement is a dietary supplement made from broccoli sprout and seed extract powder,
and may break down some of the cancer causing substances in tobacco smoke and produce
substances that may protect cells from tobacco smoke-induced damage in current smokers.
Cigarette Smoking-Related Carcinoma, Tobacco-Related Carcinoma