Fun fact - habitual drug users are no longer blanket prohibited from possessing firearms in the US, at least according to UNITED STATES v. HEMANI, decided by the Supreme Court this summer.

Of course it's not quite that simple. Among other things, the form to buy a firearm still asks if you are a user of controlled substances, and lying on the form is presumably still a felony.

The opinion is still a fascinating read and IMO a huge step forward.

https://www.supremecourt.gov/opinions/25pdf/24-1234_g2bh.pdf