A few things to try:
While I depend on inhaling my pen style cig, I also favor NOT inhaling flavored vapor from an e-cigar. I like the feel of the e-cigar best of all my devices and find myself puffing on it as I would a real cigar. It's very enjoyable and I don't feel any need to inhale the vapor. My e-cigar is five months old, has the original atomizer, has been through all my homebrew experiments, has been dropped twice to the road as I walked the dog -- and cost me $34 from DealExtreme.
Second, buy a Ruyan Vegas, which is made just for puffing and absorbing nicotine though the mouth, not the lungs.
Third, make home brew liquid and use vegetable glycerine bought at a health food store instead of propylene glycol. Glycerine is a byproduct of biodiesel production, is very sweet, and is used in foods for consumption. Very safe and produces as much vapor as PG. PG's maker advises AGAINST inhaling it.
Hope something works for you. I feel for you, man.