These treaties are ancient and mostly irrelevant, especially outside the topic of hard drugs. Unless you're doing harm to the other nations, no one will do anything.

This paper is all the way from 2012. Since its publication, many countries have pushed the limits to far greater lengths than what it talks about. Canada remains a signatory to all the old 60s-80s treaties about drugs, but can you guess what the consequences were when we legalized cannabis in spite of all of them? No one cares about these.

It's not about decriminalizing marijuana - it's about the absurd assertion that the federal government can regulate what you do personally because "yadda yadda yadda…interstate commerce!"

Treaties can't legally do an end-run around the limits prescribed to the government in the Constitution.