Heat. and how I deal with it.
 
the original e-cigarette was designed as a supplement to smoking. not as a replacement. after the idea was stolen, then mass production began, with no regard for it original design. the USA finds out about it and sales take off. we (well, most of us) are using the e-cig as a replacement. and we are used to going outside lighting one up and continually smoking for 5-10 mins.

you puff.

it gets warm.

you puff.

it gets hot.

you puff.

it gets hotter.

you puff.

things start melting.

the e-cig as designed cant take that kind of heat for that long. a friend was complaining that her carts were melting. I too noticed after using my 901's that the cart would get loose and stick to my lip. used to really piss me off, till I got my drip tip. but the carts shrank due to the heat I was exposing them to and would not hold the cart tight in the barrel of the atomizer. even I know plastic can get soft when heat is applied. since I am a heavy vaper, my cartomizers can really heat up too.

In order to get them to cool down a bit faster and maybe make them last a little longer. my first thought was a heat sink to lay the e-cig down on. then I remembered a saying that I learned with early electronics 'Put A Fan On It'.

I made a desk fan with 2 small thin pieces of plastic for sides to stand on. and an old Intel CPU fan. wired to a USB connector for 5V. the fan originally ran with 12V. the 5V makes for a gentle breeze that doesn't blow everything off the desk. it cools off my 808's very effectively.

essentially any fan would do a good job. i constructed mine with spare parts that were just lying around. so i spent no money. You can see a short video with the  cooler on you-tube or on my video page.

 

 

OVERHEATING

 

As a reference I now use a prodigy 3.1 6V with 510 standard resistance cartos.  The question as to whether or not we are burning the insides of our attys/cartos.

I have another slightly different view. As far as the comment about the paper towel and stovetop/car lighter, there are 2 things missing from your example, Liquid and airflow. That is if you want to apply your example to vaping. Liquid being present on the paper will prolong the time it takes to flash, airflow, which is also present when you take a hit off of your device, would also slow the temp increase.

Here is an example with airflow. A space heater with forced air. You turn it on, the fan comes on and the air exiting the unit becomes hot. The coils inside the heater are not glowing. The heat exchange between air moving over coils keeps the coils from glowing by transferring the heat to the air. Now stop the fan from turning, the coils will start to glow red. 

Here is another example using a beer can, liquid and a propane torch. Fill the can half way with a liquid. (Water or even beer) Light the torch; carefully apply the blue hot flame to the side of the can above the liquid level. Within a short amount of time the torch burns thru the can wall. Do the same below the level of your liquid. The paint on the can may burn up. But the side of the can will stay intact because the liquid is dispersing the heat. Of course the liquid may boil if you apply the flame for long enough.

Keeping those in mind, when you look into an atty or carto, and you apply voltage, the coil gets red. If you take a draw while applying voltage, the moving air will keep it from heating up as much, or as quickly.