My patient wants to try e-cigarettes to quit smoking. What should I say?

@article{WeidmanEvans2015MyPW,
  title={My patient wants to try e-cigarettes to quit smoking. What should I say?},
  author={Emily Weidman-Evans and Winnie Black and Ashley Fort},
  journal={JAAPA : official journal of the American Academy of Physician Assistants},
  year={2015},
  volume={28 8},
  pages={
          22, 24
        }
}
Electronic cigarettes are popular alternatives to actual cigarettes and are often used for smoking cessation. However, concerns about their efficacy and safety have resulted in calls for tighter regulation of their use. 
1 Citations
Systemic lupus erythematosus: An update on treat-to-target
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References

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Real-world effectiveness of e-cigarettes when used to aid smoking cessation: a cross-sectional population study
TLDR
Those who use e-cigarettes are more likely to report continued abstinence than those who used a licensed NRT product bought over-the-counter or no aid to cessation, and this difference persists after adjusting for a range of smoker characteristics such as nicotine dependence.
Use of electronic cigarettes among state tobacco cessation quitline callers.
TLDR
This study offers a preliminary look at e-cigarette use among state quitline callers and is perhaps the first to describe e-cigarettes use in a large group of tobacco users seeking treatment.
Efficacy of Electronic Cigarettes for Smoking Cessation
TLDR
There is limited evidence for the effectiveness of e-cigarettes in smoking cessation; however, there may be a place in therapy to help modify smoking habits or reduce the number of cigarettes smoked.
Electronic cigarettes: human health effects
TLDR
While e-cigarette aerosol may contain fewer toxicants than cigarette smoke, studies evaluating whether e-cigarettes are less harmful than cigarettes are inconclusive and some evidence suggests that e- cigarette use may facilitate smoking cessation, but definitive data are lacking.
Calls to Poison Centers for Exposures to Electronic Cigarettes — United States, September 2010–February 2014
TLDR
Although e-cigarette use is increasing among U.S. adolescents and adults, its overall impact on public health remains unclear and one area of concern is the potential of e-cigarettes to cause acute nicotine toxicity.
Electronic cigarettes in the USA: a summary of available toxicology data and suggestions for the future
  • M. S. Orr
  • Medicine, Environmental Science
    Tobacco Control
  • 2014
TLDR
The limited toxicology data on e-cigarettes in the public domain is insufficient to allow a thorough toxicological evaluation of this new type of tobacco product, and the acquisition of scientific datasets that are derived from scientifically robust standard testing paradigms, include comprehensive chemical characterisation of the aerosol will improve the scientific community's ability to perform robust toxicological evaluations of e-cigarette.
Secondhand exposure to vapors from electronic cigarettes.
TLDR
Using an e-cigarette in indoor environments may involuntarily expose nonusers to nicotine but not to toxic tobacco-specific combustion products, especially among vulnerable populations, including children, pregnant women, and people with cardiovascular conditions.
Current Cigarette Smoking Among Adults — United States, 2005–2012
TLDR
Proven population-level interventions, including tobacco price increases, high-impact antitobacco mass media campaigns, comprehensive smoke-free laws, and barrier-free access to help quitting, are critical to decreasing cigarette smoking and reducing the health and economic burden of tobacco-related diseases in the United States.