Avoiding Coke Is Key?

In the picture below, taken more than 30 years ago, you can see three famous entertainers, each of whom was / is notorious for their substance abuse and extreme living.  Only one of them is still alive today - although it is a mystery to many why he has survived as long as he has.  Is avoiding cocaine use the key?  Perhaps combing non-stimulative sedating narcotics (like heroine) with alcohol and near-lethal dozes of nicotine acts as some kind of preservative?   I don't know, and I won't be trying to find out with any personal experiments, but I do hope that when Keith Richards eventually passes away that he donates his body to science so they can sequence his DNA, or at least use tissue samples in experiments on drug resistance and telomeres.