I didn't find it addictive, but I only took it to help me stay focused when studying for exams - 1 week max. per semester. Any longer than that and I would start feeling "weird" (hard to explain the feeling).
Quite popular among students during exams here.
It is illegal as an amphetamine.Usually students buy it from children who have diagnosed with ADHD.The penalty if you get caught with it in USA are 6 months in prison I think.
It is addictive but not as much as methamphetamine(crystal) etc.It does not harm kids at all,this is peculiar.And ADHD has neurobiological basis,nothing wrong psychologically with the child,can be treated with ADHD.