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.
Carmela KNEW, but she rationalized it and pretended to herself and her Priest she didn't, or that it wasn't so bad. Out of sight, out of mind. Just like Tony fucking everything with a pulse was a known fact to her which she willfully ignored until it intruded on her life. She knew exactly what Tony was. She even knew for a fact he helped cover up Richie's murder. She knew he killed Puss, she even referred to Angie as a "widow" on "Tony's payroll."
