Cotton always had a wet T-shirt taste for me as it broke in. Rayon is a wick and vape medium. I just juice up a Rayon wick as soon as I install it, reassemble the tank and vape. I seldom, if ever, have a weird taste on the first vape. It does take a few hits to get full vapor production, though. That's probably the wicking settling in as heat makes it conform to the coil.