Buying a firearm and having a Medical Marijuana card?

[Mav714]

I'm wondering if anyone can answer a question for me? Ohio has just recently passed medical marijuana law. It's going to take us a couple years to get up and running with it ore importantly I'm curious how it will impact the Fed laws of buying a gun. On the ATF form 4743 it asks if your addicted to marijuana etc..? What happens if you've got a MM card and the ATF sees it on a background check? See where I'm going? I heard from a guy in Michigan that said you can't buy a firearm if you have a medical marijuana card. .
Why doesn't the form ask if your a alcoholic? DUI?
Anyone from other states with MMcards please help out?