I bought a cig2o menthol starter pack it comes with 18mg, and it wasen't to bad. Its was ok for a day till I wanted more nic, so I went and got the 24mg which is there highest and bam just like a cig, maybe a newport or marlboro mild but I don't even think about a cig with it. The only problem is they cost 12.50 plus shipping. I have tried to email them and ask them who fills their cartos but nothing yet they want you to buy em. If I find out I will let ever one know. The cartomizers will fit on an kr-808 I guess you need an adapter for anything eles but what whack it gives your throat is worth it.