A new piece of research from Dr. Konstantinos Farsalinos and his colleagues has provided some insight into the effectiveness of cig-a-like devices compared to e-cigarette mods when it comes to nicotine delivery. This could easily be considered the most important element of e-cig performance, because that’s why we all use them in the first place, and it’s reasonable to assume they’ll be more effective at helping people substitute smoking if they deliver similar quantities of nicotine.
In addition, the clinical trials conducted to date on e-cigarettes have used first generation (cig-a-like) devices, so while these may be around as effective as nicotine replacement therapy for helping smokers quit, it could well be that newer devices are significantly better.
This study provides some extremely useful information on this point: newer, more powerful devices are much more effective than smaller, cigarette-like first-generation devices. It was published in Nature: Scientific Reports and is available in full for free here: http://www.nature.com/srep/2014/140226/srep04133/full/srep04133.html.