I actually smoke and vape. I'm still around a half a day pack smoker, but I vape a lot.
I use a Volcano battery and Boge LR cartos with ELiquid Planet Essence or Juice Blaster juice. The start-up costs were high, but it totally paid for itself within a month. Someday I hope that I'll be able to make the switch to vaping completely.
I think the key is being ready for the change and then going with a high nicotine juice. I still vape 24mg juice regularly; some days I'll vape a 16mg though, it just depends.