Does my fasting count as invalid if I slept with a piece of a cigarette in my mouth, which I was chewing to curb the desire to smoke, and I didn't wake up until after the Fajr Adhan, then I rinsed my mouth?

If the dawn breaks and there is food in the mouth of a fasting person, and he spits it out without swallowing any of it willingly, then his fast is valid. Physicians warn against chewing tobacco because it is more dangerous to the body than smoking and causes cancer. A smoker must abandon smoking by seeking help from Allah, having sincere repentance, and strong resolve.