I know a number of people that have snorted coke, or at least they did for a while. All of these folks might possibly do it again on a rare occasion. Today all of them are doing fine; some of them are even parents. What they did was illegal, but they seem to be doing just fine in life.
On the other hand I know people into coke that went over the deep end and sufferd the concequences.
I don't think you can make blanket statements about folks based on what they did at one time.