Alcohol can be beneficial to the health used, of course, in moderation. It can do more than simply deaden pain or create a "buzz". It is also consumed without any sin when "drinking" is not the primary purpose (i.e., going to a bar to party) and having drinks with others, i.e., socializing, even at a bar, need not involve sin. Alcohol also does have the aspect of being a form of food.
What are the health benefits of marijuana? Some reports say that it can ease the discomfort and pain of certain specific maladies. If this is really accurate (and not an excuse, I haven't been able to truly ascertain the truth of the matter) then marijuana use can certainly be medicinal. Of course, that is not what the ballot measure contemplates so we have to continue.
The sole purpose of smoking marijuana is to "get high". In my experience, individuals who smoke marijuana are immediately and noticeably affected. There is no simple "buzz" that one might experience with the moderate drinking of alcohol. Judgment and motor faculties are immediately affected though the effects are small with little exposure and become greater with additional exposure. Also, in my experience, the claims that marijuana is a "gateway drug" that necessarily leads to "more dangerous" drugs is fallacious. People who use the more dangerous drugs do so because they are disposed to do so, not because they smoked marijuana.
Furthermore, I haven't figured out what the health benefits of breathing smoke into the lungs can provide. I don't understand why the political left wages a war against tobacco and even anything the just looks like you might be smoking (i.e., "e-cigarettes", depictions of smoking on movies and television, and--remember those candy cigarettes where the end was colored red so kids could pretend to be smoking?) yet advocates the complete legalization of inhaling marijuana smoke into the lungs.
Bottom line: Alcohol can be physically beneficial and not be a spiritual evil. Of course, like ingesting too much of anything, it can be harmful just as eating too much can be harmful. Marijuana is not physically beneficial, or at least I haven't seen any evidence that it is, and is usually, if not always, spiritually evil.
I will note that others will probably disagree with me on the "buzz" factor, but I am only relating my personal experiences in the matter. People often tell me that I am wrong on that matter, but, then again, those individuals usually talk and act like Cheech and Chong. (On a side note, I saw Richard "Cheech" Marin on a celebrity Jeopardy tournament. He is an incredibly intelligent man. The way he acts in his comedy routine is how I am describing the people who usually disagree with me on the "buzz" factor.)
I also agree that criminal sanctions against the possession of marijuana have done more harm to society than the marijuana itself. My question is why hasn't the I.R.S. been able to crush the drug cartels through the income tax laws?