TM  A 1999 survey of youth ages reported that 40% of smokers and 25% of nonsmokers underestimated or did not know the likelihood of smoking-related deaths  Over 40% did not know or underestimated the number of years of life lost to smoking  Young people overestimated lung cancer risk, but underestimated the fatality of lung cancer  Young people were optimistic about their personal risk from smoking Societal Factors: Inadequate Understanding of Health Risks