Yes. Then the evidence was suppressed for decades more. We have no analogy here.
> Precautionary principle should always prevail
Why? Why assume the status quo is perfect? Also, what part of pornography isn't embedded into the human status quo?
> don't use a random pesticide, unless you have a full proof that's it's harmless
There is no such thing as "full proof."
> without cigarette, without GMO and without pesticide humanity would still be fine, and maybe better without (if we stick with the cigarette)
Now do vaccines, antibiotics, filtered water, the agricultural revolution and every other life-saving invention.