Your body is telling you something. When I was young, the dangers of smoking were not known, but I never smoked. My husband was a smoker unti 20 years ago. Now that he is older, the results of his smoking have come to haunt him. Once you quit smoking, your lungs immediately start repairing themselves, but the damage done to your cardio-vascular system is forever! As a result of my husband's smoking, he has peripheral artery disease, which is decresed blood flow to all parts of his body, leading to many sugeries and angioplasty, aortic aneurisym, tongue cancer, and of yesterday throat cancer, all due to smoking. It amazes me with all the specialists he sees, the very first question they ask is if he does or has ever smoked. My husband was always a picture of health, an avid runner, now he's lucky to walk from the house to the car without sever pain in his legs. He still works, and when going into see a customer will have to fake a phone call in the parking lot, as an excuse to stop walking so the pain can subside for him to walk a little farther. It's heart wrenching to see him deteriorating like this all because of cigarettes. This not a lecture, just my story. As Johnny Carson said while dying..."damn cigarettes".
Before I quit in 1984 cigarettes especially first thing in the morning would make me nauseous. That and a feeling of "unable to quit" caused me to throw a fit and I decided to stop with the use of nicoret gum. It wasn't easy but I now shake my head thinking about how entrapped I was with not only the chemical nastiness but the time wasting rituals and ceremonies associated with smoking.
It is only a guess but in my case I feel my body was getting a toxic shock reaction.