Those numbers are so bogus as to mean nothing.
No one would answer honestly on most polls like this.
They never have nor do I suspect they ever will.
The current Laws perpetuate the Criminal activities.
And that makes Criminals rich!
No taxes are collected but Billions are spent!
And you get the side benefit of filling up Prison space with mostly non-violent criminals.
Which of couse costs even more money.
How long do you chase a losing business before you go broke?
Ask the U.S. Government.
They are experts at things like that!