crack plus

The word crack, in its relation to drug use/abuse, was once seen as slang and used only among certain people, but now, many people know and use the word to refer to the same thing. Could we now say that the word is standard, or would you still see it as slang - or could it be both slang and standard at the same time? Also, has there ever been a time in the history of the English language where there was/has been a clear division between standard and non-standard use or is the acceptance of what is or isn’t standard a more personal thing?