The alcohol and tobacco lobbyists will be dead set against the removal of prohibition. Although alcohol and other drugs tend to go together when binging, the amount of alcohol consumed will likely be less. Additionally a mild drug like Marijuana will likely be preferred by some people who would traditionally have a glass of wine or beer every day after work instead of a stronger and more dangerous drug like Alcohol.
That seems doubtful. The glass of wine or beer is, firstly, more palatable than marijuana, secondly, you can do it indoors without everything smelling like weed, and thirdly, the mild depressant effect of one alcoholic beverage is way more pleasant than getting high. Not to mention the cost.
I think for most people an entire joint by themselves is going to take care of them for the entire night (or longer if it's snuffed out and re-lit). How many beers or mixed drinks are you getting for $3.50?
Your comment is 100% opinion - I think it's very obvious that different people have different opinions. That is why I said "some people" not "all people".
Vaporisors and edibles are odorless, and the price would surely come down if it was grown in commercial quantities.