""I was a multiple-substance kinda guy. I would drink, smoke pot, do cocaine, maybe eat a Quaalude. I could go through a good portion of a quart of vodka - and that was my opener. I'd wake up the next day like I'd been hit by a truck, to the point where my skin would hurt... (but) I was a lot of fun, apparently."" Actor Don Johnson has little recollection of his past drug and booze highs.