> I don't know what the percentage is for crack but I bet it's over 90%
According to this spurious page [0], "up to 75% of those who try cocaine will become addicted." Of course, the page also says "an estimated one-in-four Americans between the age of 26 and 34 have used cocaine at least once in their lifetime, according to the Office of National Drug Control Policy." Since it looks like around 15% of Americans are between the age of 26 and 34, that would mean that "up to" 11.25% of Americans will become addicted, which seems unlikely. We need some better data.
According to this spurious page [0], "up to 75% of those who try cocaine will become addicted." Of course, the page also says "an estimated one-in-four Americans between the age of 26 and 34 have used cocaine at least once in their lifetime, according to the Office of National Drug Control Policy." Since it looks like around 15% of Americans are between the age of 26 and 34, that would mean that "up to" 11.25% of Americans will become addicted, which seems unlikely. We need some better data.
[0] http://www.treatmentsolutions.com/cocaine-addiction-treatmen...