Very true, and weed is much much less dangerous than alcohol or cigarettes.
However, I think it is a coincidence how as everything in the US is reaching peak shittiness, a ton of states are legalizing it.
Weed, while not harmful, absolutely keeps people entertained, distracted, and lets us use it as an escape from the shitty world. That is not bad, but I have a suspicion that it is actually useful to the people in power to keep people from revolting or disrupting power. Who would rather go protest after a hard day of labor vs chilling and having a gummy?
Kind of like how there are a ton of efforts to keep people addicted to phone and TV instead of taking action.