Study done on rats, not on humans. Same study mentions other studies that have proven, for humans, medically beneficial side-effects against certain specified respiratory diseases.
http://www.cbsnews.com/news/hazards-of-secondhand-marijuana-smoke/
Not an actual study, just a "smoke is smoke" bullshit article with an agenda. Sure, weed has some harmful effects, but this article doesn't support the statements made in it, and refers back to the rat study instead. You'll need something a lot better to prove that weed is as harmful as tobacco. But let's give your other sources a shot.
https://greenkidsdoc.wordpress.com/2015/02/09/childhood-exposure-to-marijuana-what-you-should-know/
"In essence there is no difference between marijuana sold for medical and recreational use. "
Come on. There are plenty of articles detailing the harmful effects of weed, but this is just weak. You just cherry-picked blogspam aligning with your opinion without fact-checking it.
This article actually proves that in ventilated conditions, second-hand smoke isn't actually harmful and results align with baseline control values. I'll give you half points however, since unventilated conditions yield worse results. It's a no-shit result, but hey, you tried.
You can enjoy weed without trying to convince yourself it's totally healthy.
Absolutely.
Now, let's get back to your original comment, you likened both kinds of smoke to be the same and thus equally harmful.
You did a.. reasonable job looking up these sources on Google. Next, try Google Scholar so the sources are at least scientific, and try to prove the above. I'm very curious, since with all the research done on both, it has not been proven that marijuana is of equal or even comparable toxicity as tobacco is. But perhaps some recent peer-reviewed article would prove otherwise.