Susan is a 58 year old lady who has recently been diagnosed with Chronic Obstructive Pulmonary Disease (COPD) after an acute admission. She smokes 20 cigarettes per day and has smoked for the past 30 years. She is keen to stop smoking as soon as possible and wants to try some form of Nicotine Replacement Therapy (NRT).

Which of the following statements about NRT is most correct?