I second Hoosier's suggestion about an eGo. I used to smoke a pack/pack and a half a day and the battery on an eGo will last me most of the day, if not the whole day. Besides the second battery that comes in a kit is well done charging by the time it's time to swap out the battery.
Fiona65 is also right about finding an all day flavor. Get some sample packs from different vendors. Don't just get the tobacco flavors. I was scared of the food & other funky flavors. But now after trying some funky flavors and the tobacco flavors I have to say that the tobacco flavors mostly taste like a yak poop sandwich. There are a few good ones out there (to my pallet). Tobacco flavors, oh man some taste like cat pee, but so far the worst food/funky flavor I has was just so so.
Fiona65 is also right about finding an all day flavor. Get some sample packs from different vendors. Don't just get the tobacco flavors. I was scared of the food & other funky flavors. But now after trying some funky flavors and the tobacco flavors I have to say that the tobacco flavors mostly taste like a yak poop sandwich. There are a few good ones out there (to my pallet). Tobacco flavors, oh man some taste like cat pee, but so far the worst food/funky flavor I has was just so so.