There was a fair amount of improper labeling, improper storage instructions for new time users, and improper understanding that edibles may be extremely potent and slower acting and can actually get you a lot higher than you might intend (vs smoking where the onset is basically instant and easier to control for).

The industry has made progress in labeling, in better indicating dosages, and in maybe avoiding certain form factors or ensuring proper packaging so that the product cannot be easily mistaken for candy.

But the amazing thing is that even with some significant mistakes / shortcomings in this area in almost all cases the result of accidental ingestion or over-consumption is basically just a matter of sleeping it off.