Answer:
The lunch destination of choice for teenagers and hospital employees.
These are believed to be found at the end of rainbows
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
What is it that given one, you'll have either two or none?
Where can you find roads without cars, forests without trees and cities without houses?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?