sentences:  It has been established that use of Swedish and American smokeless tobacco confers only 0.1% to 10% of the risks of smoking, though smokeless products in India and elsewhere in Asia contain higher levels of contaminants and thus confer greater risks.Two respected medical groups believe that smokeless tobacco may play a role in reducing smoking-attributable deaths.In 2007, Britain's Royal College of Physicians concluded "...that smokers smoke predominantly for nicotine, that nicotine itself is not especially hazardous, and that if nicotine could be provided in a form that is acceptable and effective as a cigarette substitute, millions of lives could be saved."