It's all optics and illusions. Many people associate (rightly or wrongly) that marijuana has a severe long-term adverse effect on the human mind/body, and as a result of that it is associated with X . On the other hand there is the misconception that alcohol in moderation is ok and is only adverse if it is over consumed (meanwhile really it's a Class 1 carcinogen on the same level as cigarettes and asbestos).
Also, liquids will always look more visually appealing on a storefront compared to cigarettes and the like no matter how you try and package it.