So you think inhaling smoke isn't bad for you...?
That's not what I said; I said it was trivial. Drinking soda is bad for you, but you still do it. Eating deep-fried foods is bad for you, but you still do it. The damage caused by moderated cannabis smoking is trivial in the same way that ingesting caffeine or fast food is. Don't get me wrong, smoking cannabis is a bit more detrimental than either fast food or soda (you're inhaling burning plant matter, after all), but the benefits outweigh the negatives, and the negatives are absolutely trivialized.
No, it isn't. The reason smoke would be bad for you is because it can carry carcinogens and other dangerous chemicals. Water vapor (a basic form of smoke) isn't dangerous to inhale.
This person is not a reliable source of information.
The smoke you inhale while smoking is generated by a combustion reaction of organic compounds. The two products always present in this reaction are water and carbon dioxide. However, when burning organic compounds, not all of the carbon turns into carbon dioxide. Some of it turns into carbon monoxide. Inhaling carbon monoxide is bad.
Carbon Monoxide is not toxic, it just cannot be processed. People who die due to Carbon Monoxide actually suffocate. It's merely that the CO replaces the O2 we need to breathe, so while they were inhaling gasses, they weren't inhaling enough O2 and passed out/died because of it.