I've actually been too fearful to risk carrying my pen style e-cig in my pocket. I can easily foresee me using it and mindlessly laying it on a shelf, table, chair, etc. and forgetting where I put it.
Then, of course, is the surprise of finding some freshly washed item left in a shirt or pants pocket.
Washing machine cleaned dollar bills?

Cool!
Washing machine cleaned Zunes?

Not so cool.
My original solution was purchasing an inexpensive camara bag, just small enough to carry a disassembled e-cig, spare battery and a couple carts. Worn on my belt, I can retrieve it whenever the urge hits me.
An even better solution for me was purchasing a $3.00
eyeglass strap. Attached to my e-cig and worn around the neck, I never have to concern myself with damaging, losing or searching for my e-cigarette.