It is important to remember, that everything in moderation are words to live by. Vinegar has a very good cleansing quality for removing dangerous toxins from your system. Individual results vary, but if doing this does not seem to be disturbing your body, by all means, keep it up! I have never heard of any negative results from using a vinegar or vinegar based topping or dressing.
Here is a site that shows you how to cure a back ache or even acne with vinegar!
http://www.cyberworking.com/vinegar/vinegarhealth.html
Good Luck!