Answer: most of them
examples: James Dean’s high speed crash against nothingness
Marylin Monroe’s excessive leaning on tranquilizers, as much as Elvis Presley’s and many other’s
Others do prefer to incarnate their roles in reality, like Tarzan Weissmuller
Many drink too much – but it’s a private affair, although Liz Taylor met her last husband in a disintoxication clinic
Many forget manners, if they ever had them and start shouting around at any occasion, become even violent (Aristotelis Onassis versus a photographer)
It’s true that Humphrey Bogart’s worse vice was filterless Chesterfield (he died of a cancer after)
it’s not too ask who went too far, but … who didn’t? Perhaps Katherine Hepburn.