Bill,
I have used to much smoke on one of the first butts I did. I basically turned the pork into ham.
It was a cople of years ago, so I don't remember how much I used, it was mesquite wood. I think I started with about five large pieces and then I just kept adding to it.
My guests said they liked it but, I was really dissapointed with it.
But, if you wanted ham it was really good, but that wasn't what I was shooting for.
Tom in VA