From web site of:-
Minnesota University,

Tobacco is as addictive as heroin (as a mood & behavior altering agent).

Nicotine is:
1000 X more potent than alcohol
10-100 X more potent than barbiturates
5-10 X more potent than cocaine or morphine
A 1-2 pack per day smoker takes 200-400 hits daily for years. This constant intake of a fast acting drug (which affects mood, concentration & performance).. eventually produces dependence.

Pressures to relapse are both behaviorally & pharmacologically triggered.

Quitting involves a significantly serious psychological loss... a serious life style change.

Will that do you, if not then Google for it there are 100 of papers on the subject.

Oh, by the way, it's started already, one long standing folk club has been told to leave, as the room is being converted into a pool room to try and get it used 7 nights a week due to the smoking ban!
Watch this space!
Skipy



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Possible withdrawal symptoms (after stopping tobacco use):


Irritability, anger, hostility, anxiety, nervousness, panic, poor concentration, disorientation, lightheadedness, sleep disturbances, constipation, mouth ulcers, dry mouth, sore throat-gums- or tongue, pain in limbs, sweating, depression, fatigue, fearfulness, sense of loss, craving tobacco, hunger, and coughing (body getting rid of the mucus clogging the lungs).

Symptoms may last from a few weeks to several months. After withdrawal subsides... urges for nicotine (for the effects of the drug) occur in response to all kinds of cues to smoke or chew.