Despite the widespread use of vaping, a very limited number of clinical studies have investigated the effects of this habit on the lungs of healthy individuals. Our group recently initiated the Vaping Adverse Lung and Heart Events Cohort (VapALERT), a prospective study aiming to identify the impacts of vaping on respiratory and cardiovascular health. We elected to report early findings from the pulmonary function tests performed at the initial visit of the first 83 participants recruited so far. Almost 80% of volunteers with no diagnosis of lung disease and who vape daily have an abnormal airway reactivity to metacholine and/or lung clearance index and/or diffusion capacity. We can conclude from this study that adult individuals who vape daily are very likely to present asymptomatic functional respiratory abnormalities, especially airway hyperresponsiveness, ventilation heterogeneity and reduced gas diffusion regardless of past or current tobacco and/or cannabis smoking. Longitudinal studies are crucial to determine how respiratory abnormalities observed in individuals who vape will progress over time.

The authors have declared no competing interest.

This study was funded by Quebec Ministry of Health and Social Services and the Foundation of the Institut universitaire de cardiologie et de pneumologie de Quebec

I confirm all relevant ethical guidelines have been followed, and any necessary IRB and/or ethics committee approvals have been obtained.

Yes

The details of the IRB/oversight body that provided approval or exemption for the research described are given below:

Ethics committee of Institut universitaire de cardiologie et de pneumologie de Quebec (IUCPQ) gave ethical approval for this work

I confirm that all necessary patient/participant consent has been obtained and the appropriate institutional forms have been archived, and that any patient/participant/sample identifiers included were not known to anyone (e.g., hospital staff, patients or participants themselves) outside the research group so cannot be used to identify individuals.

Yes

I understand that all clinical trials and any other prospective interventional studies must be registered with an ICMJE-approved registry, such as ClinicalTrials.gov. I confirm that any such study reported in the manuscript has been registered and the trial registration ID is provided (note: if posting a prospective study registered retrospectively, please provide a statement in the trial ID field explaining why the study was not registered in advance).

Yes

I have followed all appropriate research reporting guidelines, such as any relevant EQUATOR Network research reporting checklist(s) and other pertinent material, if applicable.

Yes

All data produced in the present work are contained in the manuscript