Marijuana [WEED] Questions?

i have this health project on weed and i need help with some questions. if you could give me a website to cite with your answer that would be good to

1. How has it developed over time?
2. How do you test for the drug?
3. How long does the drug stay in your system?
4. What is the withdrawal process for this drug like?
5. Are there any organizations that deal with addiction to this drug? How would someone get in touch with this agency/group?

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