Big Fat Huge NO! on the Karvol, or Olbas Oil or anything like that. Seriuosly nonononononononononononononononononono, it would be extremely dangerous for you, besides anything else it may contain it is oil based which can lead to a condition known as popcorn lung (Google it) which you do not want. Equally, be wary of using food flavourings that contain oil, for the same reasons.