For cotton the effect are more pronounced. Best avoid using any freebies cotton even if it's stated as Muji or Kendo. Chemical treatment often lead in residue so the cheaper the cotton, the worst it'll get.

Personally I only use Muji. Cotton bacon is dental cotton, way overpriced and anything else is just a waste of money. That inital cotton taste yall yammering about? It'll fade in like 3-4 puff. You need to change your wick after a couple of days anyway. Why spend more just to threw it away? Imo anyways.

at the end, muji is the winner.. 

Can anyone recommend me a good tank ? Currently using my humble ipv mini 2 with zephyrus tank. Looking for something disposable like super tank.

nope. supertank use occ, not rba.