Why not, because it's against the law? People from all walks of life abuse drugs, why would mob guys be any different?
Carmela to Tony, when the cop has them pulled over: "You'd think they'd be out there arresting real criminals".
Love that.... Loved everytime when they showed how disconnected Carmela and the Kids where completely disconnected to the reality of who they really were.
This to me shows how Tony was actually really good at what he does, he made them believe they were within the high standards of normal society and they were not and eventually found out they were sewage.
