I know this might seem paranoid, but my main concern is the lack of ethics in advertising something as "perfectly safe", when it might not be... well... "perfectly safe". On the other hand, one could argue that nothing is indeed perfectly safe.
If I were a medical doctor in the 1940s and advertised that research suggested that cigarettes were safe... as soon as evidence started proving otherwise decades later, I would have felt horribly guilty and ashamed.
Medicine is not yet an entirely exact science. There are many things we don't know. I say: inform people of the risks, and let them decide freely. But just don't advertise something as "perfectly safe" when it's just "safe enough" because it sounds slightly dishonest.
That's absurd. Nothing in this life is perfectly safe. Safety has absolutely nothing to do with whether something is legal or not. Sky diving is dangerous but legal. Riding bulls is dangerous but legal. What I'm asserting is that pot is known to be safe enough that it should be my choice whether I do it or not.
We're decades beyond the irrational fears you're peddling. Our president has smoked pot for Christ's sake, you can't get much more mainstream than that.