When you are smoking a full-bodied, full-flavored cigar, or any cigar for that matter and you start to feel light-headed and a little sick, that is because the nicotine is making your blood-sugar drop. When you smoke, always have something with sugar on hand to combat it or drink a sugary drink. I know some that even carry sugar packets and down them at the appropriate time to combat the effects of dropping blood-sugar levels.