Sure there are successful ballplayers hooked on alcohol and cocaine, not sure why that belief would make me pretentious. As far as me knowing much about about drugs, people and addictions, I'm not going to get into an internet contest over who has more personal experience with different drugs or addicts. I will simply respect your opinion even if I disagree.
To your question on Josh..... I wont suggest how he became addicted to opiates. While stress was likely a factor, we both know the answeres as to why someone becomes addicted to something or even starts are more complex than a single factor like stress. Personal history, taught values, peer pressure, psychological make up, temporary circumstances etc..... are but a few things that could allow stress to trigger an addiction.
Has Josh used opiates every time in the last few years when he was stressed? No, so there must be other factors in play he has addressed that have helped him deal with some of lifes stresses. I wont be pretentious and pretend to know what they are. I bet the Rangers do, and they are willing to pay him.