Most homeless are drunks first, using weed when they can get it.
The price differential is enormous. Even on the black market.
But, yeah, both destroy lives. Indisputably.
Just as some cannot handle drink, some cannot handle weed. Even though there are millions who handle both and lead normal lives.
And there are 10s of millions of do-gooders who would outlaw both, or either. Their heart is in the right place. But their goals are proven unreasonable.
Maybe 40 years ago... these days the majority of homeless are completely unmotivated POTHEADS first and drunks when they can't get enough weed. Many stoners with dysfunctional lives appear fine to those who do not know them well, but the truth is that marijuana is typically more damaging to people's lives than alcohol. Both substances cause damage to the brains of those who abuse them but marijuana seems to have more insidious effects that are not as well understood or as immediate as the damage from alcohol.