We didn't have rehab back in the Seventies. Back in the Seventies, rehab meant you stopped doing coke, but you kept smoking pot and drinking for a couple more weeks.
Racial humor was about 35% of my act when I first started. But I realized that it was a crutch. What brought it home was when another comedian said to me, 'If you changed color tomorrow, you wouldn't have any material. ' He meant it as a put-down, but I took it as a challenge.