Smoking and the effect of smoke

As far as I know smoking is dangerous because smoking can kill. This is really true smoking is one of the number one killers in the world. Smoking is not a disease but it is an addiction that can cause an illness to the smoker and to the public. Why do we smoke? I myself I don’t know but I smoke sometimes. I think the reason why we smoke because of a hobby to smoke for satisfaction. Smoking is really very addictive but it can be stop if we can find other hobby that will satisfied us.