Ill. I stopped smoking on Monday night. I think this is the reason I'm ill. It happens every time I stop smoking. I guess my body isn't used to having no nicotine in my system. I haven't given up altogether, I will still smoke when I'm drinking. I enjoy smoking but have started going to the gym more regularly and I can only manage 15 minutes at a time on the treadmill, at 7mph. I want to try for 30 minutes. I'll post results, if any.