system
Given the following post, respond as if you're commenting on Reddit:
human
[Dune] WHat does spice acutaly do?

I mean in laymans terms what does it do? Paul can sort of see into the future but no one else can, except the merchant guys become weird creatures that have to live in a tank and everyone else just gets blue eyes so i mean i am a little confused.
gpt
It basically does the following for everyone:

* Grants longer lifespans

* Makes you more healthy, basically a better, stronger and smarter you.

* Better reflexes and perception.

But for some people it also unlocks mild precognition. Paul and the Spacer Guild both relied on spice to give them an edge. Spice essentially allowed the Navigators to predict what FTL jump was safe by looking a minute or two into the future. It also changed them from having a human form into, well, the Navigators. If you've committed to spice, you have to keep taking it. Otherwise withdrawal is fatal.