Oh my gosh man...
There are TONS of articles about this very ISSUE-- i.e. not this particular case. TONS of cases of people being barred from entering the US for life because they have admitted to using marijuana. It just gets silly because I don't think you get it. Do you not think this is a little excessive?
https://www.cbc.ca/news/canada/briti...-pot-1.5322536
https://choice.npr.org/index.html?or...anned-from-the
https://qz.com/1600262/immigrants-ar...ing-legal-pot/
And many, many, many more.
Before replying, Google it. Read these links. It's not an exaggeration, it is happening.