Answer:
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
Many hear me, but no one sees me, and I only speak when spoken to
What can burn the eyes, sting the mouth, yet be consumed?
Different lights do make me strange, thus into different sizes I will change.
Take off my skin, I won't cry, but you will.
What did the piece of wood say when he saw the screwdriver and screws approaching?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?