#1 would be A, #2 would be false, as narcotics are incredibly addictive. #3 is absolutely true, as abuse of almost any medical thing can be life threatening.
The CDC suggests retesting because of the "window period." This is the length of time between exposure to HIV and when HIV shows up on a test. This can take up to three months. So if your test result is negative, protect yourself and get retested after three months.