Idk, I think it depends on the person. I smoked regularly since 2007, and earlier this year I quit for a couple months to get clean while looking for a new job. I didn't experience any type of withdrawal physically or mentally.
You're right. It really does. That's why I said "some people". Some people have more-addictive inclinations to certain drugs and their effects. A lot of people tell me alcohol is more addictive, but I can easily go months without a drink. Couldn't do that with weed until I got dead serious about it and ditched it permanently.