I agree with staying away from the cheesecake flavor. However, I personally would also explain the problem you are having to the vendors, and try to find out from each vendor exactly what is in the flavor. My daughter has a problem with artificial sweeteners in "real" foods and beverages - they make her throat feel like it is closing up. It took us a while to figure out what the problem was, since some products that have artificial sweeteners added are not sugarless. I was told by a big name gum company that they are added to regular gum as "flavor enhancers". We avoid artificial sweeteners like the plague for that reason, and read labels VERY carefully. So far, she has not had any problems with any eliquids that we have ordered from Killer Juice or Mt. Baker Vapor. You may be super sensitive to one particular component of the flavor, and it would be nice for you to know so you can avoid things that have that particular component.