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Why is this topic always brought up regarding weed, but nothing else? Should we make video games illegal because they can cause some people to live a lethargic and less productive life?
Video games are a similar threat to living a fulfilling life, absolutely. Definitely not the exact same kind of threat, since video games don't make you dumber like pot, but there is a real risk that a person substitutes accomplishing things in real life in favor of accomplishing things in a video game. Your comment is kind of whataboutism. You're not really refuting what he's saying, just bringing up a separate topi…
Using weed is a recreation activity. Most recreation activities will have a negative impact on your life if they are not done in moderation. I don't think that is necessarily a problem and the fact that this generally isn't discussed in other contexts might indicate that people are subconsciously using this an excuse when their true objections to weed originate somewhere else.