Also, I knew a guy who was always tired and drained and it turned out that the cigarettes were harming him so much that the cigarettes were creating a sludge in his
lungs and liver, leading to excessive lack
of energy. I smoke and I know it's hard to quit but quitting would probably be helpful for you. Warning though, if you get very dizzy, cold sweats, shakiness, and sometimes nausea all together can be a sign you may faint or lose consciousness. Be careful and good luck to you!