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The next highest group was adolescents aged 12 to 17

04), bronchiectasis (23% vs

The main goal is to avoid excessive usage and follow the instructions provided by a healthcare professional

[26] on the other hand, only examined current e-cigarette use, without accounting for prior smoking history: had there been a significant association between e-cigarette use and onset of respiratory symptoms, it could be due to prior cigarette smoking, in which case adjusting for pack-years would be necessary (though not necessarily sufficient) to account for this [14]

Pack-years were calculated by multiplying the duration of smoking (years) by the number of cigarettes smoked per day (cigarettes/day) and dividing by 20, and were treated as a continuous variable