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This can make your heart beat faster, increase your blood pressure, and you may begin to feel tense, irritable and anxious as you begin to crave that next cigarette

[5] Depending on how much you smoke, there's no way of knowing how much time you'll need to be all the way in the clear, but with the right combination of techniques, you can be fairly confident that you'll pass if you stop using any kind of nicotine 3-4 days before your test for lighter smokers and up to 2 weeks for heavier smokers

Wallace, M.D., Mayo Clinic

Drink plenty of water to flush out your system this will usually help flush out the hives, too