Please seek immediate emergency medical care for your chest pain. Chest pain in a smoker is a major warning sign for heart issues, and starting nicotine replacement therapy (like Nicotex) or other medications can be unsafe without a cardiac evaluation. Once a doctor clears your heart, Nicotex (gum/patches) or prescription medicines like bupropion or varenicline can certainly help you quit. However, your immediate priority must be diagnosing the cause of your chest pain. Please visit an emergency room or consult a physician right away before starting any quit-smoking aids.