Substance abuse, also known as drug abuse, is a patterned use of a drug in which the user consumes the substance in amounts or with methods which are harmful to themselves or others, and is a form of substance-related disorder.
I listen to chillhop personally and that helps. Making notes creative , finding different ways to study , use partners or make a game because studying doesnt always have to be boring I jope this helped you good luck
The answer to your question is bad breath and drooling. Hope this helps! :)