Interesting. BTW: To those wondering how you can ling hit a cigarette or a mouth-hit-designed clearomizer, you have to "slip stream" to make it possible. That means you have to put the cigarette or drip tip in your lips as usual but not tight and leave the sides of your lips slightly open to allow air in through both sides of the cig or drip tip as you draw. You can get about double the vapor from a nautilus tank if you do this, mostly because you can draw longer. I don't recommend taking long lung hits on a small clearo as you will most likely get burnt hits at some point.
As far as mouth hitting from a sub-ohm tank, I tried that but when you close the airflow up too much on a sub-ohm tank, it makes the vapor very hot and the flavor very intense. The hot vapor is what is really a deal breaker for me. However, I have found that if you put a long drip tip on a sub-ohm tank it is more doable for a mouth hitter like me. Below is the setup i sometimes use a a mouth hitting device (Subtank Nano with 1.2ohm coil on a box mod at around 20W)...
(sorry for the crappy pic...and yes, that is a cloupor mini and it has not blown up yet...lol)
That's the long stem from my now-defunct Kamry K1000 e-pipe. That makes the stem very expensive...lol. It doesn't fit all the way in but it goes past the first o-ring and is fairly stable
Yet I still find the draw too airy even at one air hole. If I close it to half a hole, then then flavor is way too intense. But small, light hits is kinda doable.
I find mouth hitting on a nautilus tank at any airflow setting at 15-18 watts at 18 or 12 mg nic very satisfying. Lung hitting irritates my throat on any tank, slip streaming or not.