Just want to point out that a cursory search says marijuana deposits about 4x the amount of tar in the lungs as tobacco. Unless it contributes to increased add

Just want to point out that a cursory search says marijuana deposits about 4x the amount of tar in the lungs as tobacco. Unless it contributes to increased addiction, the manufacturers generally try and reduce the unhealthy components of the cigarettes - making them more palatable and keeping the addicts alive for longer so they can make more money off of them. There's really no such effort with marijuana as it stands today. I'm totally unqualified to make this statement, but I'd venture a guess that most of the 'toxins' that are natural byproducts of combustion - not just the tar - are present in significantly higher amounts in marijuana. Sticking to the 4:1 ratio, someone who smokes 5 joints a day is basically a pack a day smoker.