All of these but the nosebleeds seem correct, but something much stronger like cocaine can cause nosebleeds.
But if you want just ONE answer 'impaired memory and learning' seems like the best one to pick because that is one of the most noticeable signs of marijuana use.
This website talks about the symptoms of use, I trust its accuracy:
https://www.webmd.com/mental-health/addiction/marijuana-use-and-its-effects#1
Answer:
Why is it important to get a resting respiratory rate as a vital sign rather than a rate while a person is active?
Well, because it shows your heart is actually resting.
Answer:
3 weeks, for complete healing it can take multiple months, it can take longer depending on the person.
