Is that vinyl tubing, and if so did you get it from a brew shop or a hardware? I used to buy vinyl interchangeably but lately everything from the hardware store has a God-awful stench, presumably plasticizers (it even seems little extra flexible and tacky.) Only the brew shop now has anything I'd let near beer (it is after all rated as food grade I gather, hardware probably isn't.)
Anyway my take is, if some molecules are flying off into my nose like that, they're going to fly off into the beer as easily.