Is this post a joke?
* Emergency room visits for marijuana are on the rise? Who cares. That's like being concerned about more people going to the emergency room because of stubbed toes. There is no legitimate medical reason to go to the emergency room for marijuana. In fact, the CDC records exactly 0 deaths directly attributable to marijuana
* Cancer.gov says marijuana will not only not give you cancer, but it has anti-tumor properties as well. In fact, it was shown that cannabinoids reduced lung cancer cell growth by 50%.
http://www.cancer.gov/cancertopics/pdq/cam/cannabis/healthprofessional/page4
* The largest study ever done on marijuana concluded that it does not increase the risk of lung cancer, but those who smoked had a slightly LESS risk of developing the disease
http://www.washingtonpost.com/wp-dyn/content/article/2006/05/25/AR2006052501729.html
* And your last point? There isn't even a citation for it. The DEA simply cites Dr. James Dobson, a well known Evangelist who has never had anything to do with Columbia University.
Just for good measure:
Think marijuana makes you stupid? Nope
http://healthland.time.com/2011/07/19/study-marijuana-not-linked-with-long-term-cognitive-impairment/
You cannot find one credible scientist that will list marijuana as more dangerous than tobacco... not one. You idiotically claim that pot is more dangerous that tobacco, but guess what? One substance has 400,000+ deaths per year attributed to it, and another has 0.