Nicorette Gum correctly to get the best effect â see âHow to chew Nicorette Gum â the Nicorette Chewing Techniqueâ. The benefits of stopping smoking far outweigh any potential risk from using nicotine from NRT.It is the toxins in cigarette smoke such as tar, lead, cyanide and ammonia that cause smoking related disease and death, not the nicotine. 2 Before using this medicine Do not use Nicorette Gum: if you have an allergyto nicotine or any of the other ingredients. Talk to your doctor, nurse or pharmacistâ¦