"They're going to have to make a choice," said John T. Adams, president of the Pennsylvania District Attorneys Association. "They can have their guns or their marijuana, but not both."
That's the official line, but the reality of how the policy might be enforced in Pennsylvania and other states is a little muddier. That includes the question of whether people who already own guns might have to surrender them, instead of just being prohibited from making new purchases.
https://www.yahoo.com/news/guns-ganja-firearm-owning-pot-fans-face-choice-164203955.html