
I think it is much more complex than just being level-headed and sane. Hank Williams Sr. died at 29 from pain killers and alcohol. He was born with spina bifida, leading to his addiction to painkillers.
In 2021 80,411 people died of a drug overdose in the United States. 16,706 of those deaths were caused by prescription opioids.
There have also been musicians who were lucky enough to live through all the excess.
Billy