But..but...legalizing pot has no disadvantages...
No one - literally: No one - has ever argued that here.
They have rather argued that:
The benefits (reduced incarceration of otherwise law-abiding citizens who only want to enjoy a God-given natural substance / lessening of State power to conduct a "War on Drugs" and focus on important crimes) outweigh the potential disadvantages (possible abuse).
No one here would argue that this woman shouldn't be prosecuted for Driving Under the Influence. She was impaired, people have died, and that is all entirely her fault.
But the mere possession of or use of a recreational drug - even one with potential side-effects (CBD oil, alcohol, etc.) - should not be criminalized.
The danger of misuse of any substance (a bottle of wine, a joint, a knife, or a gun) should not be employed as an argument for its criminalization.
Regards,
CBD oil is not the same as medical marijuana. It's made from a different plant.