Symptoms:

Common symptoms include:

• An intense craving for nicotine
• Tension
• Irritability
• Headaches
• Difficulty in concentrating
• Drowsiness and trouble sleeping
• Increased appetite and weight gain.

A milder form of nicotine withdrawal, involving some or all of these symptoms, can occur when a smoker switches from regular to low-nicotine cigarettes or significantly cuts down on the number of cigarettes smoked.

Symptoms of nicotine withdrawal can mimic, disguise, or aggravate the symptoms of other psychiatric problems, according to the American Psychiatric Association.