Second-generation e-cigs, like the eGo, improved vaping for a lot of users, but there were still some who wanted to get even more out of their e-cigarettes. So they started modifying them to accommodate larger batteries and higher resistance atomizers, and better cartridges and tanks.
Mid-Size E-Cigarettes & Vape Pens. As e-cigarettes became more popular, a demand grew for devices that could offer longer battery life, larger e-juice capacity, stronger vapor production and increased control. This gave rise to the second generation of e-cigarettes, called mid-sized models or vape pens (for their pen-like appearance).
Sometime, however, you just want a cigarette-like e-cig. Something simple, small, portable and easy to use. Good news: there are some awesome ‘cigalikes’ out there. What does that mean? It’s a mini e-cigarette that’s around as compact as a regular smoke.