Not sure if I understand your question. But, the answer is no you cannot get HIV from smoking anything.
any amount of marijuana smoked will eventually show up in the urine.
marijuana? yes.
yes
The same color it was before you smoked the marijuana, the color is not affected.
No but it will still show up in your hair.
probably in a hair test but not in urine
Marijuana traces can be evident in urine upto a week after it was 'consumed'. The tests will only be able to work out when it was smoked insofar as a weaker sample would suggest it had some time to work it's way out of the system, but could simply suggest less was smoked or the subject has higher metabolism rate. Traces will be evident in blood samples for much longer, sometimes up to three weeks.
More than likely.
If you smoked it in the manner you described, it can show up in urine anywhere between 60-90 days after you last smoked.
Marijuana is a fat soluble, and can store in the fat cells of the body. THC in Marijuana can be detected for up to 10 days if smoked occasionally, as long as 45 days if smoked regular.
http://www.marijuanapassion.com/How-Long-Does-Marijuana-Stay-In-Your-System.html
No. Unless you are a licensed medical marijuana user.