So basically, the higher the resistance, the cooler the vape, right?
Well, yes, sort of. I think it's more correct to say, the higher the wattage, the hotter the vapor or the lower the wattage, the cooler the vapor.
Here's the deal, if you are coming from an eco-CC, then your resistance on your coil was either 2.2 ohms or as low as 1.8 ohms. So we'll just say it was 2 ohms. The voltage on an ego battery is 3.7-4.2 volts for the most part when charged up and working properly. Let's just say 4v. We won't take voltage drop into consideration as there is very little on a fixed voltage ego compared to a variable voltage ego set above 4v.
That is Very low wattage vaping with a cool vape and low vapor production compared to today's standards & product offerings, not taking into consideration the cigalikes and the pod setups.
Vaping at 4v on 2 ohms, your wattage is 8 Watts.
So lets say you want to go to a 0.3 ohm coil.
You would have to vape at 1.55 volts to get 8 watts. If you set your mod at 8 watts on a 0.3 ohm coil, you wont even get any vapor. I just set my mod to 8W with a 1.0 ohm coil....no vapor. You'd really have to crank up the watts on your mod to get anything out of it. By the time you found the wattage you want to get the same vapor production as your ego CC, your up high in the wattage and your draining your battery much faster than if you just go with, say 1.5 ohm coil.
So the point is here, as I said before, if you want the same exact vape, or at least somewhat similar to your ego CC, 0.3 ohm coils would be a grave mistake.
Now you unless you build your own coils, you won't get any 2 ohm coils in today's modern tanks. But you can get as high as 1.8 ohms if you go with a tank like the aspire nautilus line. I suggest the kanger toptank, though, because it comes with an RTA deck so you can build your own coils very easily later on if you want.
SO, for a kanger toptank, you can get the SSOCC coils at 1.5 ohms, however they are harder to find than the 1.2 ohms. So at 1.2 ohms, if you set your mod to even 10 watts, you will get ABOUT the same vape as an ego CC at 2 ohms.
Let's say you end up bumping it up to 13W-15W. A single 18650 battery mod will last a good many hours assuming you are not chain vaping. Even then you have about 3-5 hours at that wattage. maybe more.
HOWEVER,
Keep in mind that everything will be different as the ego CC is a very tight hit, whereas today's tanks, even the ones that claim they are mouth-to-lung tanks, are CONSIDERABLY looser draw than an ego CC tank. You will also have to draw lighter or you will end up flooding your coil at such low wattage.
If you want the same exact thing out of you new setup, including a super tight draw, you may want to look into a pod setup like a myJet or a Cync or a Juul. The Cync has a box-type setup. As with your Ego CC, these pod systems are not able to be adjusted. They are basically the same as egos and cigalikes in that they put out a fixed 3.7-4.2volts.
http://vapespider.com/?s=myjet
http://vapespider.com/?s=&s=cync&ct10995[]=115&advanced_search=yes
http://vapespider.com/?s=juul
Whatever you do, please think twice before getting a sub ohm tank like a Smok beast with a 0.3 ohm coil unless you intend to increase your vapor temperature and production. I think you will be sorely disappointed if you are looking for a cool vape and no mega clouds.
Yes, it is true, the hotter the vape, the more the flavor, but you have to consider what is more important for you, mega flavor, or cooler vape. You can't really have both.