Oh my dear lord. Read
this article you twats.
Again, that's not ME saying that. And that quote I pulled out is far, FAR more detailed in its description of the effects of smoking marijuana and the chemical properties of marijuana and cigarette smoke than some nutjob at the National Institue of Drug Abuse simply stating "marijuana smoke is bad mmmkay" and not even supporting their claims with scientific evidence.
You don't have to believe me, I really don't give a shit if you do, but don't call me a liar for citing information from credible sources that make your arguments look silly.
Here's the facts: No one has ever died from marijuana use. No one has ever been diagnosed with cancer from marijuana use (ironically, marijuana helps in riding of cancerous cells, who knew?!), no one has ever been attributed to respiratory ailments due to marijuana use. Again, that's not me making this shit up, that's just the way it is whether you want to believe me or not. The shit has been around for thousands of years and the only properties it has are good ones. I personally wouldn't smoke it everyday multiple times a day, but if you're smoking it moderately (a couple times a week), there's as close to zero risk involved as you can possibly get. Or you can do like Vimana said and get a vaporizing or make edibles and squash the risk to zero.