In case you want to stick with a smaller battery and clearomizer set-up - This 1 is about 4mm larger in diameter than a cig-a-like, but it's still smaller than a dime, and is a very good, set-up, IMO. I still have 1 in my rotation, for quick trips to the neighbor's, the gas station or store, etc., or when I don't want to take 1 of my much larger set-ups with me. I've also helped others start vaping...by supplying them with the extra starter kits I've purchased. They
all have loved it!
It's only 13cm long (including the drip tip it comes with, and it's changeable), has a 650mAh battery, a nice little top-fill TopEvod glass tank (IIRC 1.7 or 1.8mL capacity), and it takes the still readily available KangerTech Dual Coils in the off-white box. They come in a wide range of ohms, too. I definitely wouldn't buy the much more expensive VOCC coils that most places want to sell you to use in them. I've used the Kanger Dual Coils for many years and so have others.
Kanger Top Evod Starter Kit - It's only $8.26 when you use the coupon code 4JULY17 until 11:55PM EST on July 5th. In fact, you may want to buy 2 of them while they're on sale!