From my personal observations, I don't think coke is quite comparable to heroin. Heroin takes over a person's life in a much more scary way than coke. Heroin becomes the number one thing every day, before food, family, or any other concern. Granted, you can easily be a high functioning heroin addict, if the expense and acquisition are not concerns, but at a point, heroin merely makes you 'normal', and even slightly outside that window is a steep descent into withdrawal hell.
Coke is both better and worse. Not quite as addictive, but it seems to damage people more than heroin does (particularly mentally).
