I don't like Mariah Carey's singing or urban yodeling in general. I won't start a campaign to banish it if other people enjoy it.
I don't enjoy marijuana, so I don't partake. Likewise, I won't start a campaign to banish it. It's not a publish health issue - I can't catch a high just because someone in my vicinity is high.
When individuals infringe on the rights of others as a consequence of using marijuana (e.g., DUI), there are already laws to address this.
So why the "war on drugs"?