Using a single smoking cessation product should give you roughly the same amount of nicotine as your smoking habit. Overdosing is difficult but not impossible. You can use a combination of these products, such as chewing nicotine gum while wearing a patch when you're having a particularly rough time staying away from cigarettes. But the more high-dose nicotine products you use, the likelier you are to experience nicotine overdose symptoms. This is especially true for people who smoke while using smoking cessation products. If you experience negative side effects from using a smoking cessation product, you should switch products, choose a lower nicotine strength, or stop using that type of aid.