FWIW, I was trying out some new 302 atomizers last night. These are quite a bit different than the 510 atomizers, with a softer draw, and create a much larger volume of vapor. I put in some PG liquid and choked. I couldn't stop coughing for hours. I could barely vape at all after doing this. I don't think it was the PG, but it just hit me wrong. This morning I went right back to it, but more cautiously this time. Everything is working out well . . . I just had to relearn how to vape, LOL.