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Represa A, Ben-Ari Y (2005) Trophic actions of GABA on neuronal development

Univariate comparisons were performed using an unpaired two-tailed Students t test for continuous variables and Fishers exact test for categorical variables

The study did note, however, that heavy to very heavy marijuana users (defined as smoking one or more joints daily for a period of more than 10 years) did show some degree of decline in respiratory volume and strength

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But many Americans think e-cigarette aerosol is safe

1 2 Richard Craver, "For use: a lot of empty space," Winston-Salem Journal , May 30, 2010