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 =>increases the no. of sick call visits especially the respiratory infections 
=>Decreases night vision.
=> Decreases hand-eye coordination.
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Long-Term Effects of Smoking
Lung, mouth, throat, kidney, and stomach cancers
Coronary heart disease 
Emphysema and other chronic diseases Significantly reduced lifespan – If teens continue their habit into adulthood, they can expect to spend over $75,000 in excess medical care related to their smoking, and a life expectancy up to 20 years shorter than non-smokers
.Contrary to common belief, smoking may also increase depressive symptoms in some adolescents. 
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