Anyone with true yiras shamayim would have a VERY GREAT FEAR of eating something not kosher. If you were aware that something non-kosher definitely causes cancer, would you just check the ingredients and eat it? You can be sure that eating something non-kosher is far worse for a son or daughter of the King than the worst cancer. You should follow your Rav, but in the absence of a personal psak, be very very careful about what you eat.
