Today's top pros are generally not gambling for hours on end for their money..what i do know about all the pros from the past that used whatever stimulant to help their game it did give the spurts until it started wearing down then they blew all their winnings back. you cant tell exactly how high you are from it while playing. but it works for awhile.
oh, by the way all those guys died young and broke. the list is long. care to join them.