I started vaping about a year ago with a greensmoke clone(e9) I chose the greensmoke because of the cartomizers and to be honest I didn't know any better. Then about 6 months ago i saw 7-11 selling the njoy NPro I figured 20 bucks for an express kit ,why not give it a shot (the draw on greensmoke was way too stiff for me) well the battery life was horrible and have you ever tasted the tobacco carto's that come with the Njoy....Yuck, like ... dipped in tea, but the draw was good and the vapor production was pretty good. Then I found this place, ECF, and found out that the npro was a 4081 and I could buy blanks from various retailers....woo hoo what a find! I filled my blank carto's with my own juices and i was in vaping heaven except the battery life still was poor. Now I am the proud owner of a KGO but the draw is just too airy the battery life is excellent but i just can't get that vapor that the 4081 produced. So is it a learning curve thingy? do i have to just get used to it? Or will an adapter to use 4081 carto's solve my problem? has anyone had any experience with 4081 cartos on KGO/EGO/Riva batts?...thanks.