I'm new to this forum, but had been vaping for about 1/2 year or so. I currently have a ego spinner as a main battery, and a ego-twist as my back up. using the new artemas slim/ regular tank with a 2.0 ohm single coil cartomizer (single punched hole) at about 3.6-3.8 voltage depending on the battery i use. My question is, when i vape, sometimes, there will be this stingy sensation in my mouth or on my tongue, is that normal? The other question is, there are times when i vape there's flavor when i inhale and exhale, but sometimes there's no flavor on the inhale, but theres flavor on the exhale. Am I using the wrong voltage or am I doing something wrong?