Why would nicotine gum be helpful for a smoker trying to quit, since it contains the harmful drug?

Gum contains such a low amount nicotine the smoker can barely tell it is there
Chewing the gum takes the smokers mind off of cigarettes, which changes their habit
It helps reduce the nicotine withdrawal Symptoms while keeping the other bad chemicals out of their body
When used with cigarettes, it provides enough nicotine to eliminate the urge and just a few days

of using the gum can help break the physical addiction and dependence on cigarettes.