Briefly: "This is essentially an abuse of the system," a rep wrote on Steam. "Once we figure out a way to prevent abuse, the restriction will be lifted." You can still sell items on the Steam market, but person-to-person trades are no-goes.
PUBG Has Temporarily Disabled Steam Item Trading On Third-Party Sites
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In 2019, because we’ve already seen a shift away from it in a lot of movies and TV shows, it’s not the biggest deal if a major video game decides to not show any of its characters smoking. It is interesting, though, if the game is making a point of it.
A worst-case scenario: being the subject of a video on the subreddit Livestream Fail titled “Guy wrecks car while reading Twitch chat and driving.”