In addition, Zyban has plenty of competition from nicotine gum and patch treatments.

FORBES: Prozac To Fight PMS Under New Name

Research shows that nicotine replacement medications like nicotine gum, patches or inhalers double a smoker's chances of quitting.

NPR: Smoking Bans Help People Quit, Research Shows

" Says Mitchell Nides, director of Picture Quitting in Los Angeles and another Pfizer consultant: "I've been in the field for 20 years, going all the way back to nicotine gum.

FORBES: Tobacco-Free

Nicotine chewing gum was thought maybe to mimic this.

BBC: Lozenges

Nicotine anti-smoking gum is one example.

ECONOMIST: Medical confectionery