If a white cigarette with a black filter would work, try Joye 510 in white and instead of the white atomizer and short cart use a cartomizer on it (I use standard resistance Boge soft-caps - you cannot use LR low resistance ones on slim
batteries). I recommend a manual battery - your finger will hide the button. Manuals are much safer from drips from refilled cartomizers - Joye 510 manuals are totally sealed on the threaded end, right where a carto would drip (autos can be killed by drips there). Cignot.com has white Joye 510s. ANd NoSmokeVA.com - I don't know what brand 510 they carry but their PCC 510 kits are really nice and they do sell a kit with white 510. The PCC can carry cartomizers if you remove the bottom condom. 510 is a bit fatter than a cig - it's 9mm diameter.
If you want a weak ecig with small atty and tiny carts but the same diameter as a cig, look at manual M402 or manual M401 for better battery life. MyPVShop.com has them and
buy separate blank carts because the carts with the kits are sometimes the old style which I find harder to fill. The blank ones sold separately there are new style. Both require a bent paperclip to push up the tiny
juice cup. Or you could look at Blu, a weak cartomizer model.