It’s called the MORE Act and has passed the House Judiciary Committee. It’ll definitely be altered if it were to ever be made law but as it stands it would remove cannabis as a schedule 1 drug so in essence you could grow your own.
And just like today you can make your own beer, moonshine, clothing, food, etc but people still buy this stuff for convenience and better quality than what they can produce at home. Those industries are still doing very well in fact.
This would add to that list and even by the most conservative estimates would generate millions for the government and millions more for private citizens.