 Withdrawal symptoms, mood, quality of sleep, cognitive performance, temperature, blood pressure and heart rate, MAO-A parameters: plasma DHPG dihydroxyphenylglycol, HVA homovanillic acid, 5HIAA 5-hydroxyindolacetic acid; MAO-B parameters: urinary excretion of phenylethylamine, platelet MAO-B activity; hormonal parameters: serum ACTH, cortisol, TSH, thyroxine, triiodothyronine; EEG; cigarette liking; expired air CO; and functional brain activity. 