I usually try to be gentle when people ask about initial experiments with opiates. But, OP, what you seem to be imagining is at best not true. Sure, plenty of musicians used dope. Many of those musicians were also broke and borderline homeless early in their careers (Kurt Cobain comes to mind). But I never see anyone say, "hey, if I gave away all my money and lived under the interstate, maybe my creativity would skyrocket." Dope is glamorized as fuck. But being an addict couldn't be less glamorous, or less prone to creative breakthroughs.
By all means, experiment all you want. But don't kid yourself: opiates won't make you a better singer. They'll just make you into an opiate addict.
Love,
an opiate addict.