Celeste is still high on marijuana, and her words are slurred. She is trying to say "what are you doing?'"
Whataaare you doooingah?
Wahhh, I told you to stop, now I'm getting second hand smoke from you.
The doctor told Celeste that because of her addiction, she has an inflammation of bronchitis, and an increased chance of a heart attack. If she took other drugs with marijuana, it can amplify the effect that her heart rate sped up, and that the blood vessels in her eyes expanded, making them look bloodshot.