There is one pretty big difference: NOBODY smokes pot because they like the aroma, nor do they consider it an enriching cultural experience; a sensory experience to be cherished. Nope. Nothing like that. They smoke pot to get stoned, buzzed, whatever the expression of choice. If they didn't get stoned from it, no one would buy or smoke pot.
My first employer (back when I was 13) told me that everybody knew about pot when he was young, and it wasn't illegal then, either. According to him, it was used as a substitute for tobacco when you couldn't afford the real thing. Everybody knew it made you dizzy if you smoked too much... My how things have changed, eh?
When I drink a beer, it is because I am thirsty. When I drink some other alcoholic beverage, it is because I genuinely LIKE the taste of what I am drinking. Quite frankly, I wish the stuff had no effect on me at all, then I could have as much as I wanted. Every night would be Margaritaville! I could have a big cold beer with lunch, and my favorite liqueurs could be had anytime I felt like it.
There are also thousands of years of cultural baggage that comes with alcohol, especially in beer and wine. 500 years ago, if you drank water, you were going to get sick from it, whereas all the alcoholic beverages were pretty safe from disease. We have all this cultural acceptance of booze, and that barrier is not going to come down very fast.