Vaporizing still releases CO and other poisonous gases.
Quality of weed makes no difference to the crap released when ANYTHING is burned.
Smoking or vaporizing anything will eventualy harm your lungs.
There are no accurate figures regarding lung damage from pot therefore it is impossible to say how many secret pot smokers have been diagnosed with cancer and it has been attributed to cig smoking.
I accept the health risks the same as when I decide to emmulate Barry Sheen on the backroads where I live , YOU AIN'T GONNA LIVE FOREVER !!