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Additionally, 19.9 % of high school smokers and 17.2 % of middle school smokers reported smoking for 20-30 days within the past month

doi: 10.1016/j.amepre.2023.02.026 43

30 12.4.3.5 Heterocyclic aromatic amines Heterocyclic aromatic amines are carbon-based compounds containing more than one ring of carbon atoms with one ring containing a nitrogen atom
Cigarettes contain more than 4,000 chemical compounds and 400 toxic chemicals that include tar, carbon monoxide, DDT, arsenic and formaldehyde

These limitations may affect the representativeness and predictive capability of research findings