What part of the body does stress cause to tense up as a defense mechanism?

Summarize the neurobiology of addiction section in 3-4 sentences. summarize the evolutionary history of cravings in 3-4 sentences. then explain how the "science of getting hooked" article, and these issues, relate to your own life. then connect this discussion to recreational marijuana. new york state is getting very close to legalizing recreational marijuana, which is why they carried out the above study on potential impact of regulation. what are the potential health impacts cited in the above study if marijuana were to be regulated in ny? how do you think addiction would be impacted by regulated marijuana? considering what you now know about the brain, body and addiction, what are your thoughts on legalization of recreational marijuana in new york state?