No man, that's wrong. A person does not smoke more cigarettes because they know they won't get more ****ed up. It's a nicotine addiction, plain and simple. You can take two bong hits and be high for 2-3 hours and then that's it. Tobacco smokers have a PHYSICAL CRAVING for nicotine, and if they do not get it, their withdrawl symptoms get very ugly.
That is a test conducted in mice and dogs who were exposed to extremely large amounts. That's like the studies the US gov did in the 60s on Rhesus monkeys by pretty much drowning them in marijuana smoke for months.
As for the testimonies, those are in no way credible, and even if you wanted to make them credible, note that the people who answered smoked on a very consistent basis. Smoking once a day is not good for you in any way and if doing it prolonged, it will cause issues, just like any other drug. As for marijuana, the issues that can be caused are extremely lower than that of Alcohol and Tobacco, and you simply cannot argue that. Every recent medical study (including this one) has listed tobacco and alcohol as much more dangerous than Marijuana. Infact, off the topic of marijuana, alcohol has been put on top of coke in many studies as well.
As for your 5 x worse thing, I seem to have missed that.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1277837/?tool=pubmed
HAS NOT BEEN CASUALLY LINKED WITH LUNG CANCER hmm.. what else.. how about A connection between marijuana smoking and lung or colorectal cancer was not observed. Or better yet this:
Furthermore, compounds found in cannabis have been shown to kill numerous cancer types including: lung cancer [9], breast and prostate [10], leukemia and lymphoma [11], glioma [12], skin cancer [13], and pheochromocytoma [14]. The effects of cannabinoids are complex and sometimes contradicting, often exhibiting biphasic responses.
It seems your claims have just been sent out the window. Disclaimer though.. a lot of the stuff in the report is over the head of anyone who hasn't taken college level biology, sorry about that.