All those backpackers in Laos also thought they could see what they were drinking, then they couldn't see at all when the wood alcohol blinded them.
I've certainly been poisoned by alcohol more than I ever have by cannabis.
In fact cannabis has completely cured the arthritis in my finger joints. (I should probably say remission instead of cured).
Before cannabis they were too swollen to wear rings and very painful.
Now, no pain and no swelling.