It’s not physically addicting for anyone. That was proven long ago. Some researchers think it is psychologically habit forming, (far from actual addiction) but that has not been proven.
It does have varying affects on cognitive ability. Especially at younger ages, which is why it should be avoided while still in school. While the brain is still developing, anything will have a negative affect, including alcohol and many prescription drugs.
If someone smokes every day for 40 years are the an addict? It is psychologically addicting. I’ve seen it happen. I didn’t say it should be illegal but the argument that it isn’t addicting is ludicrous. It destroys motivation in teenagers.