I am a 26 year old female student that just recently (3 weeks, 4 days) quit smoking. I am taking Chantix. I smoked for 8 years. I have never had back pain before until I stopped smoking cigarettes. I'm starting to live an active life because I am free from cigarette constraints. Can someone tell me why my upper back hurts so bad? and If anyone has ever heard of smoking cessation doing this to anybody?