The short answer: YES.
The long answer: You may as well ask if any Jews were ever really put to death at Auschwitz. Your efforts to cast doubt on a history of repression reveal your agenda, which is really no more admirable than those who would try to convince us that the Holocaust never happened. It reveals the same level of politically-driven intellectual dishonesty.
And if you fail to see the relevance of that answer, you entirely lack critical thinking skills, and should return to the special-ed classes from whence you came.
The short answer: YES.
Finally - someone who sees the fork in the road and has the stones to make a decision! (Although, you do realize it was a 50-50 shot - no?)
Let's get down to the particulars. It's vitally important because the existence of the entire Liberteen agenda hinges on it.
You say that people HAVE BEEN IMPRISONED for smoking pot. That brings up some very obvious questions. 1) What were they charged with? 2) How many people are there behind bars for the very same thing? 3) Can you name one?
Short answers will do...