American Journal of Respiratory and Critical Care Medicine

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*Corresponding author (e-mail: ).

Supported by awards from the National Institute on Drug Abuse of the NIH (K01 DA042687), the National Cancer Institute of the NIH and Food and Drug Administration Center for Tobacco Products (U54 CA229974), and the NHLBI of the NIH (K23 HL136854). The funding sources had no role in the study design, data collection, data analysis, data interpretation, or writing of the manuscript or in the decision to submit the manuscript for publication. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH or the Food and Drug Administration.

Originally Published in Press as DOI: 10.1164/rccm.202012-4441LE on April 15, 2021

Author disclosures are available with the text of this letter at


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American Journal of Respiratory and Critical Care Medicine

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