INTRODUCTION

Nicotine is responsible for the highly addictive nature of tobacco products, but most tobacco-caused disease is not directly caused by nicotine, but rather by other chemicals present in tobacco or tobacco smoke.1 The strongest evidence for direct causality for nicotine is for birth defects (neuro-development), with only limited evidence supporting causal links to cancer and cardiovascular disease, and scarce data for COPD. Despite this, many misperceive nicotine as responsible for smoking-related health risks, like cancer.2, 3 These misperceptions are not unique to the general population; in one study, 60% of nurses incorrectly perceived nicotine as carcinogenic.4 This study explores physician perceptions of nicotine risk in a national survey.

METHODS

This analysis represents a national mail survey exploring physicians’ knowledge and communication about tobacco use, collected between September 2018 and February 2019. The survey targeted six specialties: family medicine, internal medicine, OB/GYN, cardiology, pulmonary/critical care, and hematology/oncology. The sample was drawn from the AMA Physician Masterfile, and 500 physicians from each specialty were randomly selected. Overall, 1058 physicians participated and 496 physicians were ineligible (e.g., not seeing outpatients), yielding an AAPOR response rate of 51.8%. The survey domains included tobacco treatment practices, harm reduction beliefs, and tobacco/e-cigarette knowledge. Physicians also rated (on a 4-point scale) if they agreed or disagreed that “nicotine directly contributes to”: the development of birth defects; cardiovascular disease; cancer; and COPD. We estimated prevalence and adjusted prevalence ratios (APRs) for strongly agreeing that nicotine causes each outcome as a function of physician gender, age, and specialty using multivariable log-binomial regression models, controlling for race/ethnicity.

RESULTS

Participant characteristics are summarized in Table 1. Overall, the majority of physicians “strongly agreed” that nicotine directly contributes to the development of cardiovascular disease (83.2%), COPD (80.9%), and cancer (80.5%). Comparatively fewer “strongly agreed” that nicotine directly contributes to the development of birth defects (32.9%) and 30.2% did not answer this question—a potential indicator of “do not know.”

Table 1 Sample Characteristics and Beliefs About Nicotine by Specialty, N = 1020
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Misperceptions regarding nicotine’s role differed by physician characteristics (Table 2). Females were more likely than males to correctly perceive nicotine risks for birth defects (APR 1.28, 95% CI 1.07–1.54). Younger physicians were also more likely to correctly perceive the impact on birth defects. Pulmonologists were less likely than most other specialties to misperceive nicotine as a direct contributor to COPD. Additionally, family physicians were more likely than oncologists to misperceive nicotine as a carcinogen. Paradoxically, OB/GYNs misidentified risk related to birth defects more than other specialties.

Table 2 Prevalence and Adjusted Associations with Belief That Nicotine Directly Contributes to Development of Birth Defects, CVD, Cancer, and COPD (N = 1020)
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DISCUSSION

To our knowledge, this is the first study to document widespread nicotine misperceptions among physicians in the USA. While it is possible that some physicians may have misunderstood the question (e.g., considered harm caused by tobacco, rather than nicotine), results are consistent with other studies finding notable nicotine misperceptions.2,3,4 Correcting misperceptions should be a priority given that in 2017 the FDA proposed a nicotine-centered framework that includes reducing nicotine content in cigarettes to non-addictive levels while encouraging safer forms of nicotine use for either harm reduction (e.g., smokeless tobacco) or cessation (pharmacologic NRT).5 Short communication interventions can effectively correct such nicotine misperceptions.6 It is vital that physicians understand the actual risk of nicotine given that they are critical in the prescribing and recommendation of FDA-approved NRT products. Moreover, so they can accurately communicate risk in an evolving tobacco marketplace which may include low-nicotine cigarettes, which are not safer than traditional cigarettes. To best serve patients, physicians need to be better informed that the primary risk of nicotine in tobacco products is due to addiction/dependence, while other carcinogens and chemicals, particularly those produced by combustion, serve as the primary source of risk for tobacco-caused diseases.1

Access to Data

CDD, MBTM, and MBS had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. All authors contributed to preparation of the manuscript.