Many e-cigarette companies market their product as a tool to help smokers quit. However, the FDA's Center for Drug Evaluation and Research has not approved any e-cigarette as a safe or effective method to help smokers quit. Instead of quitting, many e-cigarette users are continuing to use e-cigarettes while still using conventional cigarettes. 

In 2015, 58.8 percent of the people who recently used e-cigarettes also currently smoked conventional cigarettes.6 The U.S. Surgeon General has found that even smoking a few cigarettes a day is dangerous to your health. The U.S. Public Health Service has found that the seven therapies approved by the U.S. Food and Drug Administration in combination with individual, group or phone cessation counseling are the most effective way to help smokers quit. Until and unless the FDA approves a specific electronic nicotine delivery system or e-cigarette as safe and effective for use as a tobacco cessation aid, the American Lung Association does not support their use for cessation or any direct or implied claims that e-cigarettes help smokers quit.(Source lung.org) 

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It is recommended to use one of the seven FDA approved medications for tobacco cessation.