Buying as a present

http://e-smokeireland.eu/epages/950002218.sf/en_IE/?ObjectPath=/Shops/950002218/Products/DCCXLKIT
http://e-smokeireland.eu/epages/950002218.sf/en_IE/?ObjectPath=/Shops/950002218/Products/%22Drip%20Tip%22/SubProducts/%22Drip%20TipBlack%22

the top link is a dual coil cartomiser kit. it will give a nice rougher vape than other cartomisers, warmer vapour and a lot of it too. the warmer vape can mean a little bit of flavour loss, but to be honest if he's smoking 40 fags a day his tastebuds are probably shot anyway

the second link is a drip tip, you just pop that into the top of the cartomiser when you're using it. something easier to wrap your lips around than the cartomiser itself.

to use the cartomiser you just fill it with juice (you drip the juice in onto the filler inside the device, the filler soaks up the juice and feeds it to the heating coil inside. it can take a little while to get comfortable enough to just.. know when you're filled it enough but it just takes time to get used to it, it's easy as hell to do
juices is always a tricky one to reccomend, i assume he'll want a tobacco type juice?

http://www.thebestshop.eu/standard-eliquid-pg-/-vg/10ml-eliquid-pg/prod_99.html
http://www.thebestshop.eu/liqua-eliquid/cat_40.html

have a look at both those links and maybe pick out a few 10ml bottles, so he can try difference juices out

from the first link, i always loved winston/wensten deluxe tobacco and marlb(us red mix) and from the second.. the french pipe and traditional tobaccos are nice
24mg or higher i'd say since he smokes that much, although you might have to order from abroad if you want higher than 24mg.. dont know if any of the irish sites have it