Withdrawal symptoms are aided by your body realising it's blood sugar level may be very low. Nicotine blocks the production of insulin which controls blood sugar levels. With nicotine in your system - your stores of sugar and body fats are let go into your blood - tricking system into believing that you have eaten.
The flue-curing consists of heating the air in a very well closed barn. An outdoor fire blows hot air (very hottest!) into metal pipes running into the barn. There's no direct contact between the fire and the tobacco, the hot pipes just heat the inside air. The process is put to use in curing Virginia tobacco for cigarettes and Connecticut type wrappers. The goal is to fix the color on yellow to get bright tobaccos.
Quitting cigarettes it's not an easy task