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Bassett noted that there are demographic variables in who smokes including that people with lower education levels, and such often lower incomes, smoke more though they are often the most targeted by tobacco companies

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Prolonged use can lead to nicotine addiction or other health issues, including cardiovascular, respiratory, and neurological illnesses

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For example, one study of 54 e-liquids found many products labeled with natural or artificial flavors, and just four samples listed specific flavoring substances (Hahn et al., 2014)