Electronic cigarettes (e-cigarettes) are the fastest growing harm reduction product. Many e-cigarette users obtain nicotine blood levels from e-cigarettes that are much higher than those from nicotine replacement products and, in some studies, similar to that for tobacco cigarette users. Given this, one would expect abrupt cessation of e-cigarettes to produce withdrawal symptoms but this has not been tested. We propose to recruit 120 long-term e- cigarette-only users. Participants will enter a within-participants study with random, balanced order of assignment to four conditions: a) their own e-cigarettes, b) a new nicotine e-cigarette, c) the non-nicotine (i.e. placebo) version of the new e-cigarette, and d) no use of any e-cigarettes. The use of nicotine or non-nicotine new e-cigarettes will be double-blind. Participants will be instructed to abstain from tobacco and nicotine products during the study. Each condition will last 5 days with a 2 day washout between conditions. To encourage compliance we will use an escalating payment system with bonuses that has resulted in high compliance rates in our prior studies. Participants will monitor symptoms of nicotine withdrawal daily via an Interactive Voice Response system. They will also attend 3 lab visits/week to provide carbon monoxide and cotinine samples to determine compliance payments, and to complete longer surveys, a cognitive task and a task to measure increased motivation to use e-cigarettes. We will test the effect of abstinence (own e-cigarette vs no e-cigarette) and its pharmacological specificity (new nicotine e-cigarette vs new non-nicotine e-cigarette). Our results will help determine a) the addiction potential of e-cigarettes, b) whether labeling should warn purchasers of e-cigarettes that abrupt cessation can induce withdrawal, and c) whether withdrawal problems should be included in risk/benefit assessments of e-cigarettes.

Public Health Relevance

One major concern about e-cigarettes is their ability to cause a physical dependence on nicotine; i.e., to produce withdrawal symptoms when they are stopped. This possibility has not been tested. We propose to test for nicotine withdrawal symptoms among former smokers who currently use nicotine-containing e-cigarettes daily during four conditions: a) when they stop using e-cigarettes, b) when they use only non-nicotine e- cigarettes, c) when they use only a new nicotine-containing e-cigarette, and d) when they use their own e-cigarette. If stopping e-cigarettes causes withdrawal, then a) consumers and health care professionals need to be educated about this and b) policy makers need to consider this liability of e-cigarettes when deciding on regulation of e- cigarettes.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
1R01CA192940-01
Application #
8847521
Study Section
Special Emphasis Panel (ZRG1-AARR-G (55))
Program Officer
Hunt, Yvonne M
Project Start
2015-09-09
Project End
2018-08-31
Budget Start
2015-09-09
Budget End
2016-08-31
Support Year
1
Fiscal Year
2015
Total Cost
$411,619
Indirect Cost
$139,749
Name
University of Vermont & St Agric College
Department
Psychiatry
Type
Schools of Medicine
DUNS #
066811191
City
Burlington
State
VT
Country
United States
Zip Code
05405