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They excluded current, nondaily smokers and ex-smokers who quit before age 15 years or after age 65 years

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Researchers pulled data on 2,512 young people from the Truth Longitudinal Cohort, a probability-based, nationally representative, longitudinal sample of youth and young adults between 15 and 24

If any provision - or any part of it - of this Agreement is declared void, illegal and/or unenforceable then the other provisions shall not be affected unless it would have been impossible to conclude the Agreement without the void, illegal and/or unenforceable provision