Thanks for your coursity, but to let you know that my hubby used to smoke, few years ago he stop.And that's what really what I don't understand, why he is experancing chest pain on and off at this time that he is not smoking at all. One thing that I can say is maybe... Just maybe stress, but again doctors don't find anything. Like I said before, my husband already went thru x-rays and ekgs and still nothing that we inform about.