Sage advice: Don't think about experimenting. Just walk away if presented with the stuff.
That begs the question - what does one do when everyone else around them is using a drug that, while maybe negligibly harmful, gives them the upper hand at doing your job? Do you relegate yourself to taking out the trash for the drug-enhanced super-performers, or do you bend to the pressure?
It's an interesting topic, to be sure. I am of the same opinion that I am not about to try some random drug, but I am not so sure that I would be able to resist the temptation of a "Limitless" type substance.