I've read that smoking can make discs degenerate, but I always take reports on smoking with a grain of salt. They seem to like to inflate the numbers, and if someone smokes and has DDD it doesn't mean smoking caused it, or even contributed. Otherwise every smoker would probably have them.
Either way if I have surgery, I need to quit. I'm just scared, because it's hard to do and being in this horrific pain makes it even harder.