When i started to use eroll i use 2 cig one in pcc one in my mouth...and chain vape all day.that my one baterry is dead.i was very sad and think thAt i couldnt vape with only one cig.but i did.it is great.i vape much less than earlier.i took done puffs and put cigarette in pcc.and now i use only one.i bought two new complete cig but i didnt use tham.i order carry case but i think that i will use slot for another cig for 2 cartridge.what you think about this?did you try this?