Tolerance can in fact cause an overdose, because the greater tolerance you can get the more of a certain substance your body will need eventually leading your body to take more than it can handle leading to overdose and death.
The sclera is the answer for your question
Answer:
It will be endorphins
Explanation:
any of a group of hormones secreted within the brain and nervous system and having a number of physiological functions. They are peptides which activate the body's opiate receptors, causing an analgesic effect.
The most reliable source of medical health information is always a physician. Although certain websites can contribute accurate information they are not always as detailed as a physician.