Nicorette Menthol Mint chewing gum contains nicotine and is used to counteract the withdrawal symptoms most smokers experience when they want to reduce or stop smoking. Do not use if – You are allergic to any of the ingredients of this medicine. – You have a serious heart condition: – a recent heart attack; – cardiac arrhythmias; – a tight, painful feeling in the chest (angina pectoris); – a so-called Prinzmetal angina. – You have recently had a cerebral haemorrhage (stroke). – You have an inflammation of the mouth, throat or esophagus