My post is regarding the debate of marijuana vs cigarettes ..which is more dangerous?
Speaking from the point of view of someone who works with oncology drugs, no one really knows which is more of a carcinogen. The mere act of inhaling fumes from something that is burning is toxic. In fact, eating burnt foods are thought to increase your risk of stomach cancers. Burning is a chemical reaction.
What is generally thought to cause cancer (besides tar) from cigarettes is not inhaling smoke, but what is in the tobacco. Tobacco farms certainly treat the tobacco with fertilizers and pesticides. Do marijuana growers treat their crops with pesticides? I would certainly think so. And most definitely wood that is to be processed into paper (you have to roll it in some type of paper), decking material or whatever else is chemically treated. So whether you light up a cigarette or a joint you are releasing these toxins and inhaling them.
The biggest thing to keep in mind is that cigarette smokers smoke 20-40 cigarettes a day for years on end. Certainly marijuana smokers do not have that many in a day and I have never heard of someone who is 80 years old and has been smoking marijuana since they were a teen. So, perhaps it's the quantity that is dangerous, but I don't think we can say that marijuana should be made legal and cigarettes banned because marijuana smoking doesn't cause cancer.