That's probably true but I don't think we can quantify the difference unless/until recreational marijuana is legal in most/all states. I voted against rec-pot in the Maine referendum, and having seen the tragic results of alcoholism up close I wish rec-alcohol were not a thing, but that ship sailed long since. So, apparently, has marijuana's watercraft. One positive thing I'd say about legalization concerns its reputation as a "gateway drug". If that was ever true, IMO it was because the pot suppliers were the same people who sold heroin, crack, and other things with a greater profit margin. Getting those dudes out of the process will close that gate (if it was ever open.)