This is FUD.
ADHD is well researched, and well understood by those who study it. The problem is that people think ADHD is just an issue of self discipline or attentiveness. It is not. It is a serious disorder with serious effects that are unambiguous. No doubt there are stimulant seeking people who claim to have ADHD to get stimulants, and people without ADHD representing that they have ADHD may lead to the impression that the disorder is ambiguous when it isn't. Also if someone has ADHD for long periods of time they may have co-mobidity with other disorders such as depression, etc. and this also may muddy perceptions.
ADHD is not strictly an attention issue. It's named for attention because that is an early and obvious symptom but it is much worse then that. Calling the disorder an attention deficit disorder has turned out to be very bad as it leads people to the wrong mental model of the disorder. Thinking that it's just laziness on the part of the patent or the patents parents, in the case of children. This is a tragically misguided perception, based in ignorance and the poor choice of names.
In actuality ADHD is a developmental disorder that is a more general impairment of executive function that includes regulation of emotion, working memory and the internal perception of time and other effects in addition to inattentiveness. This impairment is due to abnormal dopamine transport that can be clearly observed in MRI studies.
These studies have been repeated many times in many contexts, with various controls, and been thoroughly confirmed.
Also, you are wrong about Adderall. There is a significant difference between meth and Adderall. Stimulants are by for the best understood, most tested, longest used, and lowest risk medications in psychotherapy. Only a few stimulants show clinical improvement in the function of people with ADHD, and the improvement can be profound. Caffeine for example does not show these clinical improvements.
So basically you know jack shit about this topic, and therefore should keep quite, just like any other medical condition you know nothing about. It actually causes harm by interfering with the dissemination of reliable information in the study and treatment of a very serious disorder.
For better (read: actual) information start here:
Here: https://youtu.be/GR1IZJXc6d8
Or for a more complete talk:
Here: https://youtu.be/SCAGc-rkIfo