I did a short line of crank one time with the horrible effect of my feelings and emotions being completely seized. It was an extremely disturbing sensation and not one I would ever choose to repeat. (And it didn't even give me an erection. )

Heroin...I've had so many junkie friends. I've always liked them a great deal; they are generally intelligent, creative, intriguing and intrigued people.
Creepy....hmm...yes, there is certainly a creepy vibe to heroin users. They always, without any exception I've ever seen, have a flat, charcoal-grey aura. Not sure how to explain it....sort-of like they are living within a deep-grey cloud that never moves or shimmers, but just hangs around them.

I've been very curious about heroin for many years of my life. Forced myself never to use it, however. Heroin users...might be more sad than creepy. They are very, very sad. As Neil Young put it, so precisely...Every junkie's like a setting sun...