I was taught all kinds of things in school that are questionable :-) OK. I just spent 20 minutes searching medline. There is one report, cited above, where a bunch on kids got sick after eating excessively green potatoes. Maybe they were the cause. Plausible. There is a report from 1918 of a single case. That's it. The rest are animal studies. Lots of them. There is a reference that describes low absorption of orally administered potato toxin(s). Draw what conclusions you will. I'm still avoiding them, but I'm not sure it matters,,