..in my mouth! I have exeprienced this before when I quit smoking but never to such an extent. It is pretty pretty bad. I am learning again on quitting smoking. 4 hours is the time it takes to crave nicotine in the long run (in between each cig). 2-4 weeks is the worst of withdrawal symptoms.  i wonder if this is why the smoke breaks in hospital were every three hours and not longer time in between? I am always a bit amazed we can smoke while in hospital. You may not beleive it but I wrote a kudos letter to Clifford Lincoln, the then minister of health, when he introduced a law against smoking in hospital. I was in first grade or second grade and it was a school project. I got a letter back inviting me for breakfast with the minister of health and my parents. I was very excited. My parenst refused to take me there. How disappointing for an 8 years old!