You may already know this now, but I want to post it for those who don't because it's really cool and way ahead of its time.
That was for the VMU, the visual memory card. It stored your game saves but also some games had minigames you could play directly on it, often with bonuses in the main game. In the Sonic Adventure games you could take care of chao and such on it. That thing ate batteries like candy though.
None of what you just said is correct.
Scientific consensus was never that cigarettes were healthy. Advertisers pretended it did, and you clearly fell for the ruse.
Consensus was never that GMOs caused cancer. There's no proven study that established that link.
And lastly, "science itself does not consider that it is always right" makes no sense as a statement. Are you trying to say that science reflects our ever-changing understanding, and thus we must always be ready to update our beliefs when presenting with new information? Because it that's your point, then one, you are extremely bad at expressing what you mean, and two, that means you believe in science.