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"These lighter-smoking young adults frequently do not even consider themselves smokers," she said, but they are still at "risk of developing coronary heart disease from smoking even a small amount of cigarettes." For the new study, Hackshaw's team looked at data from 141 studies

This absence of filtration means that smokers could be ingesting more tar and toxins, which can further compromise lung health

The changes come amid increasing concern about teens using vape products

The authors estimated that 318 cardiovascular and diabetes deaths for every 100,000 person-years are attributable to smoking and 36 to higher exposure to PM 2.5