However, if one is finished vaping for the day, then it is better to leave the tank almost empty and refill the next morning. Filling a tank and leaving it sit overnight will sometimes cause the tank to leak.
This would be when one checks the o-rings, proper seating of a coil head assembly for a true RTA / SubOhm tank / Clear-o-mizer. If you couldn't figure out why the tank leaked setting full overnight you then may want to consider a different style / brand of tank.
If Smok can make their low end atomizers to not leak, then, no excuse for any other manufacture to have leaking aromizers. And yes Smok has done that in the past. I used some of their evod style tanks that never really leaked. Once or twice I had to blow out excess juice but that I don't consider leaking as it was done with intent.
Some of Smok's stuff now might leak like sieves, or not. I don't use "Tanks" much or at all any longer. I squonk and use RDAs with bottom feed (squonky/capillary) 510 pins. (If I don't squonk, I drip regular style using RDAs.)
I see people here and on other forums mention Smok's quality has gone to crap, they make leaky tanks. I have to take that at face value. That's why I say it might leak now. I don't know but read that's the case a good bit.
Still I would be troubleshooting the reason a tank leaked starting with o-rings and coil seating. Both are usually not too difficult to fix. Once fixed you might enjoy using the product. If not PIF it, go buy something else.