Those things usually contain kasine which is known to have addictive properties
Tell me whether you mean the way the body works, what happens when you get injured or all of the above and i will answer your question
Activity can help prevent heart disease and stroke by strengthening your heart muscle, lowering your blood pressure, raising your high-density lipoprotein (HDL) levels (good cholesterol) and lowering low-density lipoprotein (LDL) levels (bad cholesterol), improving blood flow. and your hearts over all function
Because the chemicals in them would damage your skin because of the structure of your skin cells.
Stronger heart and lungs. Increased bone density. Reduced stress. Reduced risk of heart disease and some types of cancer.