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At this scheduled face-to-face session, participants who passed the second exhaled CO validation were invited to sign the written consent form, complete a self-administered pre-intervention questionnaire, and be randomly allocated to the intervention or control group
How E-Cigarettes Might Affect Allergies and Asthma The e-juice/liquid in e-cigarettes contains harmful substances that could trigger an asthma attack or worsen nasal allergy symptoms, either by the person using the e-cigarettes or even from a person breathing the secondhand aerosol that comes from the e-cigarette
Among 87,028 participants, there were 22,115 ever-smokers aged 2069 years who provided information on their smoking history and their experience of tobacco withdrawal symptoms
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