It's called drug abuse
It bolsters one's physical state if it create an abnormal impact to one's body by stopping the usage. For example, some one who suddenly stopped taking heroine will experience an excruciating pain in their body
It bolster one's psychological state if the drug have no medication effect to their body, but they somehow still crave it
It is necessary to use universal precautions to prevent the spread of diseases
Yes this is very important
The Answer to the question is A.
No sally cannot because the information is not related to holly. the information has to do john. If sally tells holly when the paperwork is ready to be picked up holly could possibly not give the papers to john.