If you don’t add baccy it doesn’t burn as well or as evenly. Unless it’s like really bone dry and finely ground. Which imo can be a bit too harsh.
Also, you’re wasting a lot of weed as it burns between puffs, which is why a lot of the yanks smoke it using the one-hit-and-pass approach.
Both styles, of course, have their merits. Lack of cancer-causing tobacco being a big one. But personally I go with the Dutch school when it comes to all things weed.
Or at least I would do if i wasn’t a forty year old, married, law-abiding citizen. :/