Smoking is on the decline. But if you are one of the 28 million Americans still smoking, you probably know how hard it is to quit. 

Close to 70% of smokers report that they want to stop smoking. Of those, 55% said they tried to quit in the previous year. Only around 7% succeeded. 

There are plenty of reasons to try to reduce your nicotine addiction: Tobacco use – and smoking, in particular – accounts for about...