First of all, you don't know a thing about what you are talking about. I have been smoking weed since I was 13 and my nerve transmissions are faster then they were when I was a kid. I am a WHOOP ASS guitar player and can defend myself because I have EXCELLENT reflexes. My nerve connections are AWESOME.
The resin from Marijuana gets spit up and put in the trash my friend. There is VERY little pollution in Marijuana smoke and the harmful products have an expectorant-like quality to them.
But that's not to say that I don't take a lot of Fish oil supplements and that might be helping the resin to get spit up (not attractive). Marijuana does have an underbelly though... my particular chemical make-up doesn't seem to experience it like others do. Maybe others cannot expel the resin like I can, in that case... they could have a problem in the passage of the resin which should not stay in the body. I think it would also make sense that if one had a condition for which marijuana would help, that their individual body chemistry would allow for a more positive bodily reaction to the substance. Marijuana, just like the cells of the body has intelligence and when it enters the body, it knows what to do.
God made mankind with THC receptors built in so that we could use the plant as a medicine. Think that I am full of shit? Read it
here.
I'm actually cutting back on my smoking because I have bought too many guitars this year... one should clearly not smoke too much pot, it should be used with care and be more of a medicine than an intoxicant. It doesn't take much Marijuana to have a therapeutic affect and smoking more might not even get one higher... I have cut my weed smoking in half recently and I am still getting the same therapeutic benefit, so I was smoking too much weed to a certain degree.
Plus, I have been diagnosed with "EXPLOSIVE ANGER DISORDER" when I was in my twenties and Marijuana helps my loved ones to see a softer side of me. I'm not a maniac, but I do have overactive adrenal glands.