Well considering alcohol has 0 harmful effects on the small scale I referenced, but a few positive effects. Makes it "as good if not better" than marijuana as there seems to be so few if none negative effects, but also only positive effect is stress relief, which can be found in other things than marijuana. While the other is not true on Alcohol, other than excercise and eating healthy.
Not saying marijuana is bad. But for everything we know about alcohol and marijuana (since we dont know near as much about marijuana as we do alcohol) alcohol trumps marijuana if used sparenly in a healthy manner.
Also it is possible, may just be inconceivable since it is so much and may take some short cuts that means more than just injesting it. Because one can overdose on anything, even water.