[thoughtomator]

..weed has always been illegal.

Incorrect. There was nothing illegal about it until the 1930s, when it was made illegal on the heels of a propaganda campaign connecting it with Mexicans and claiming it caused white women to have sex with black jazz musicians.

[photodawg]

There was nothing illegal about it until the 1930s
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forgive my blanket statement. 60 years is however, quite a precedent legally. You are dealing with inertia with both vices. Many would love to eliminate both, and many would love to have both legal, so the status quo remains.