sentences:  In the United States, a study based on National Health Interview Survey data found that 73% of smokers who switched to smokeless tobacco as part of their latest quit attempt were successful in quitting smoking.In the same study, smokers who used pharmaceutical nicotine products in their most recent quit attempt had success rates between 0 and 35%.Scandinavian snus is a moist form of smokeless tobacco which is usually placed under the upper lip, and is not smoked or swallowed.