Apropos of not much, but life experience tells me that people who consume alcohol are far more concerning gun owners than those that smoke weed.

I know for a fact in Virginia you were explicitly told when getting your medical cannabis certificate from a doctor that you would then be ineligible for a concealed carry license.

The 4473 still hasn't changed, so it still appears to be a felony to buy a gun from an FFL if you use recreational marijuana, since it would require lying on the form to get it approved.