Nicorette 4mg Classic Gum Extra Strength is a kind of nicotine replacement therapy that helps smokers quit smoking as well as withdraw from nicotine dependence. Extra Strength of 4mg nicotine is suitable for heavy smokers -- those who smoke more than 20 cigarettes per day.
Nicorette 2mg Classic Regular Strength Gum is a kind of nicotine replacement therapy that helps smokers quit smoking as well as withdraw from nicotine dependence. Regular Strength is suitable for those who smoke 10 or less cigarette per day.