i am now on a process to reduce my smoking habits but i will shiver violently if i don't smoke for at least 2 hours. at night, i will go through extreme cold turkey and cannot sleep. i used to went through heroin withdrawal last year and it was like the worst human despair and agony i had went through but luckily i manage to overcome it even without the help of professionals and doctors. i know that drug withrawal can be fatal to some people so i'm the lucky one, but how about tobacco/ cigarettes.