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Pltslig Ovntad dd hos Spdbarn (The National Board of Health and Welfare, 2016)

These centres are centres of gravity , and they are symmetrically distributed around the centre of gravity of the original triangle

Sources: Harm Reduction Journal: Estimation of the global number of e-cigarette users in 2020 Emerald: Estimation of the global number of vapers: 82 million worldwide in 2021 Truth Initiative: E-Cigarette Fact Sheet FDA: Results from the Annual National Youth Tobacco Survey CDC: Smoking and Tobacco Use: E-Cigarette Use Among Adults American Cancer Society: New Research Shows E-Cigarette Use Up Sharply Among Younger Adults in U.S

University of East Anglia Rhinology and ENT Research Group