You will have a better luck with "Erdos amphetamines" or something like that.

Still, uh, using amphetamines or amphetamine analogs in controlled dosages from pharmaceutical sources is a pretty normal thing to do, a pretty normal thing that doesn't seem to cause a whole lot of problems for most people. We give it to children to make them sit still, and many adults take it, too.

There are some analogs, like Methylphenidate, which are said to be less addictive, but many people prefer, and use Adderall, which isn't, and both are deemed to be safe enough to give to children in small doses. We even give straight up Dextroamphetamine to some people (though it's rather less common)

I mean, dosage is super important, of course, and so is purity, but yeah, lots of people take small amounts of amphetamines without problems.

Edit: As someone else pointed out, methamphetamines are similar in effect to, but generally more dangerous than amphetamines, and the latter, I believe, is what Erdos, and most everyday users under medical supervision use.

He is probably referring to how he took amphetamines, which aren't meth.

Paul erdos was an amphetamine user in his later life.