Nicotine replacement therapy
Nicotine is the addictive drug in tobacco products, so there is a chance when using NRT products, to become addicted to those products in place of the tobacco habit. Generally it is argued that NRT products are safer then smoking tobacco. NRT products are generally expensive, sometimes even more so then cigarettes, so a minority of people may become addicted to the NRT product and turn back to tobacco products to save money.