@Bella Dea,
Using heroin is not a death sentence.
Everyone who has used heroin isn't dead, and everyone who will use heroin will not die from that use.
Heroin is an addictive drug, but it is a myth that if you use it once you will become addicted.
Even addiction isn't a death sentence, although it's a pretty nasty state of being.
I don't know what Hoffman's personal life was like anymore than I know if there is life on Mars, but I'm willing to bet a fair amount of money that he wasn't Jack Armstrong All-American Well Adjusted Boy, until he snorted the stuff or spiked his arm.
You can take heroin or other opiates to escape your pain or to seek pleasure.
A single minded pursuit of pleasure, whether through drugs, sex, power or anything that causes your brain to be flooded with certain "pleasure" chemicals, will always be ruinous if not interrupted.
This doesn't mean, however, that drugs must always lead to ruin.
Unfortunately, it is the weak willed who partake of drugs and then find themselves on the road to ruin.
Obviously there is nothing wrong with pleasure and opiates are a great source of what we consider to be pleasurable. All things in moderation of course, but some people have no ability to moderate. Perhaps this makes them great artists, but it makes them foolish consumers of drugs.
These drugs, in one form or another, have been used by mankind since our earliest awakening to sentience. Hell, lemurs and monkies get high eating millipedes, and they go back for more.
One can view them as a forbidden fruit that once tasted will spell ruin or... something else.
Puritanism is a self-preservationist state of mind for humanity because people, generally, have a hard time dealing with pleasure, and a tendency to go overboard. Perhaps this is a valid reason to outlaw drugs, but we should be honest about it. Drugs are not evil and neither is pleasure.