Perhaps. I will stipulate that for those with no knowledge of recreational drug use, this could be an interpretation.

However, anyone familiar with recreational drug use knows there's a common phrase of "know your dosage" right along "know your dealer". Yes, it's borrowed from else where, but it's still a thing. Do I need to eat half a bar, or take 2? I might suggest Wolf Of Wall Street as an example of knowing one's dosage.

That phrase is about knowing the maximum dosage beyond which the side-effects render the trip unpleasant; along with the threshold dosage below which you don't get any effects.

Taking "too little" Ritalin recreationally — i.e. not meeting the threshold dose — doesn't result in ADHD-like symptoms.

Unless, y'know, you have ADHD. In which case it's not "recreational usage", you're just self-medicating.

Dear lordy, you must be having an agenda here. Other people are injecting ADHD into this conversation.

People taking Ritalin when not prescribed to them by a doctor do not care about ADHD-like symptoms. They are using it purely as an upper. "To help them concentrate" or whatever they tell themselves. It's less "trashy" than meth, easier to find than coke. The affects are also different than these other drugs.