I am new to vaping. I have used the c4 cartos, the premium cool carts and the wow carts. Hated the wow, they are out of my equation. I like the premium carts but the throat hit is different from drag to drag. Sometimes its like taking a drag off a cigarette and other times it makes me cough, cant put it in to words. The c4's have the absolute best vapor of all and the drag is very consistant. Problem with the c4's is the taste. A few drags and i have great flavor then next time i get a weird plastic rubbery taste. If i can figure out how to get the taste consistant, these would be my only choice for a carto. I had an issue with the drag being like sucking through a straw and found a fix for that. On my premium carts, i plug one battery hole with a tiny piece of toilet paper and on the batteries i use the c4 carts i plug 2 holes and it is the closest thing to taking a puff off a cigartette (yes toilet paper, taping the holes was a major pain in the ...). Do you need to let the juice soak for a while in the c4's before you use them or just fill and vape. Also how long do the c4 cartos last, do they last the same length of time as a regular filler material carto. Sorry im just learning and i too and spending a small fortune trying to find what works the best. Good news though, in all my learning and trying, ive cut down from over 2 packs of smokes a day to less than 1. When i find the right equipment, i want to be completely smoke free.