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While cannabis does increase blood pressure often times, it does decrease blood pressure in other instances. In the context of posture, it’s likely that cannabis lowers blood pressure more often than elevates it. Regardless, cannabis users develop tolerance to the cardiovascular effects of the cannabinoids. Overall, cannabis does not pose a major threat to the heart for the vast majority of users and, when cannabis increases blood pressure, it’s only to a modest extent, most of the time.

Part 1)
1. Molecular and Cellular Biochemistry 2006 – http://www.ncbi.nlm.nih.gov/pubmed/16444588
2. Biochemical Pharmacology 2013 – http://www.ncbi.nlm.nih.gov/pubmed/23537701
3. Journal of the American College of Cardiology 2010 – http://www.ncbi.nlm.nih.gov/pubmed/21144973
4. British Journal of Pharmacology 2010 – http://www.ncbi.nlm.nih.gov/pubmed/20590615 ,
5. Environmental Toxicology and Pharmacology 2013 – http://www.ncbi.nlm.nih.gov/pubmed/23721741

Part 2)
1. Mayo Clinic Proceedings 2012 – http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3538401/
2. American Heart Journal 2013 – http://www.ncbi.nlm.nih.gov/pubmed/23351819
3. BMJ Open 2012 – http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3289985/
4. American Heart Journal 2008 – http://www.ncbi.nlm.nih.gov/pubmed/18294478
5. The report presented by the National Institute for Public Health and the Environment – “This investigation has been performed by order and for the account of the Ministry of Health, Welfare, and Sport of the Netherlands, within the framework of project V/267002, A doubleblind, randomized, placebo-controlled, cross-over study on the pharmacokinetics and effects of cannabis.” http://www.rivm.nl/bibliotheek/rapporten/267002002.pdf

Part 3)
1. American Journal of Cardiology 2006 – http://www.ncbi.nlm.nih.gov/pubmed/16893701
2. BMJ Open 2012 – http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3289985/
3. American Heart Journal 2006 – http://www.ncbi.nlm.nih.gov/pubmed/16504646
4. Mayo Clinic Proceedings 2012 – http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3538401/
5. British Journal of Pharmacology 2012 – http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3413845/
6. Journal of Addiction Medicine 2011 – http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3045206/