From the "study" cited:
"1357 hospitalized adult cigarette smokers who planned to stop smoking, received tobacco cessation counseling in the hospital, and were randomly assigned at discharge to a tobacco treatment recommendation (control) or free tobacco treatment (intervention)."
My guess is that the 'hospitalized adult smokers' had some heavy suggestions to 'plan to stop smoking' and that the ecigarettes used by the tobacco treatment were cigalikes - less likely to switch or more likely to include dual use than Mods that produce the smoke/vapor experience smokers prefer.
A more objective review of that study can be found
here, Bloomburg took the "sensational" approach.
"I think the message of this paper is that using e-cigarettes infrequently or using them with cigarettes is just not an effective way to quit smoking. Many of these people didn't even use e-cigarettes once a day. People who have success with [approved] smoking-cessation medications use them regularly. That is probably how e-cigarettes need to be used if they are going to be effective."
"In this setting, the use of e-cigarettes intermittently and concurrently with other cessation aids did not seem to aid quitting and may have hampered it. The possibility remains that e-cigarettes can promote tobacco cessation if they are used regularly and as a complete replacement for cigarettes, which is how conventional cessation medications are recommended for use."