I would also want to add that many of these terms are regional and subculture-specific.

In the specific part of Germany I grew up in, a ‘joint’ was any smokable rolled cigarette-like object with cannabis in it. Nobody used any more specific words like ‘blunt’.

Then talking to people one town over, they looked at you as if you were from the moon if you called anything a ‘joint’ that didn’t have tobacco in it. To them, a ‘joint’ was exclusively a mix of cannabis and tobacco, and a ‘blunt’ was cannabis-only.

Then there’s people who add weed to pre-bought cigarettes, people who insist on using leaves, filters and no filters, tobacco or no tobacco, and so on. Most of these terms are really regional.