Is the term for physical and mental symptoms that happen after stopping or lessening use of tobacco products.

Nicotine is the addictive chemical in tobacco. It reaches the brain during tobacco use and affects mood and behavior. The effects become linked to feelings and habits. Trying to lessen tobacco use can result in mental and physical changes that are not pleasant.

Symptoms may include strong cravings, anxiety, increased hunger and difficulty concentrating. They're usually the most intense in the first week or so after quitting. Most symptoms pass after a month, but cravings may sometimes return.

Treatments include medicines, nicotine replacement products and counseling. Support groups help people deal with nicotine withdrawal and overcome the urge to use tobacco.