[singingfish]

I'm not sure how you'd manage to "smoke the equivalent of 2 packs of cigs in something like 4/5 hours". Firstly you're not inhaling any combustion products, so that's not equivalent to start with. Secondly the absorbance of nicotine from ecig vapour is much lower than when nicotine is inhaled in the form of smoke such equivalence is not really measurable.