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"Our study shows that second-hand smoke during childhood leaves its mark at the molecular level and can alter the expression of genes that influence disease susceptibility in adulthood", first author Marta Cosin-Tomas, a researcher at the Barcelona Institute for Global Health (ISGlobal), said

the most successful efforts efforts to render tobacco less harmful have been those involving mechanical means

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Young children are especially vulnerable to thirdhand smoke as they are more likely to put their hands in their mouth after touching a contaminated surface