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Does MJ smoke cause lung cancer or emphisema?

^ Nah, no such study exists eh... don't worry about it.

References are as follows:

17 SEG Fligiel, MD Roth and EC Kleerup et al., Tracheobronchial histopathology in habitual smokers of cocaine, marijuana and/or tobacco, Chest 112 (1997), pp. 319–326.

20 DP Tashkin, Is frequent marijuana smoking harmful to health?, Western J Med 158 (1993), pp. 635–637.

21 GA Caplan and BA Brigham, Marijuana smoking and carcinoma of the tongue. Is there an association?, Cancer 66 (1989), pp. 1005–1006.

22 KS Sridar, WA Raub and NL Weatherby et al., Possible role of marijuana smoking as a carcinogen in the development of lung cancer at an early age, J Psychoactive Drugs 26 (1994), pp. 285–288.
 
Good point dablah, I think the way tobbaco closes your lungs contributes to disease by holding toxins in. Also I would think that there are very few people who smoke the equivalent amount of marijuana to a pack of smokes everyday, even taking into affect filters.

If you rolled a joint with the same weight as the average cig, it would be fairly large. Twenty "large joints" a day? I'm sure that there exist people out there with habits of this size, but they are few and far between.

So lets say your average smoker burns down two "large Joints" a day all by themselves. Obviously thats a tenth the smoke the average tobbaco smoker inhales. What I am getting at is that the fact that tobbaco smoking causes lung disease may be partly due to the amount of smoke inhaled. We won't know for sure until someone does a study involving subjects that only smoke marijuana, and do so in large amounts.
 
We shouldnt gloss this issue over, letting people think they arent at risk for lung cancer because the risk is less than tobacco smokers. Its dangerous. I will defend my position that you are always at an increased risk of getting lung cancer if you smoke ANYTHING.
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While it is completely reasonable to have the hypothesis that smoking cannabis causes lung cancer (and it is one that I have), without a definitive study to prove it, believing that this is the absolute case is ridiculous.

Could THC be cyto-toxic to cancer cells? Well it is in vitro.
Could their be large amounts of anti-oxidants flavaoids in cannabinoid smoke? It's not impossible.
 
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BilZ0r said:
While it is completely reasonable to have the hypothesis that smoking cannabis causes lung cancer (and it is one that I have), without a definitive study to prove it, believing that this is the absolute case is ridiculous.

Could THC be cyto-toxic to cancer cells? Well it is in vitro.
Could their be large amounts of anti-oxidants flavaoids in cannabinoid smoke? It's not impossible.
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Now in responce to the science in your post.

Any anti-oxidant flavinoids present in cannibis would almost surely be combusted (oxidized) by the heat needed to vaporize.
An anti-oxidant already in its oxidized state can actually act as a carcinogen (eg vitamin E).

Also I would like to point out that the argument isn't that THC is carcinogenic but rather than smoking pot is carcinogenic. I myself would never argue that THC is itself carcinogenic but rather that cultivation techniques, and burning of general plant material is the culprit here.
 
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Bah... anyway...

Any anti-oxidant flavinoids present in cannibis would almost surely be combusted (oxidized) by the heat needed to vaporize
Not really man. The temperature inside a joint or a pipe is a gradient from the combustion zone to other areas. There are temperatures that could vaporize all kinds of important antioxidants without destroying them... there are pyto-antioxidants that vaporize at room temperature or close to (allicin, thymol, eugenol, cavracol, and curcumene, and gingerone) and those last two have been shown to have anti-tumor activity... (Have a look at Goff et al., Science, 2006 311(5762):815)

An anti-oxidant already in its oxidized state can actually act as a carcinogen
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Some of them do, some of them don't (i.e. dehydroascorbic acid).

Also I would like to point out that the argument isn't that THC is carcinogenic but rather than smoking pot is carcinogenic.
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Yeah, I'm awear of that, that's why I was talking about "smoking cannabis".
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I've only been smoking weed for about 2 years but in that short time period I've had smoking-induced acute bronchitis at least 4 times.
Each time, it seems like I get bronchitis easier, and I fear that one day I will succumb to chronic bronchitis. Lately I've also noticed even worse lung capacity than usual.
 
ok BilZ0R, looking back at that post of mine it really was crap

i would say that as its non polar then its non water soluble, but THC does have an OH group... yet i know its not water soluble, hmm

i'm not sure why i thought it was a fat though...

i think the point of that post was to point out that as a resinous substance THC could be thermally decomposed into a tar

oh and ^dude, bronchitis 4 times in 2 years of smoking weed? you been in haling fiberglass dust as well or what? (ok i odn't htink that can cause bronchitis but serisouly, how much weed have you been smoking in said 2 years?)
 
a lot, everyday, many times a day

my dumbass would keep on smoking despite showing early symptoms, and i would totally fuck over my lungs
 
yeah, uacvax... i hope you;ve quit for a while at least...

and oooh... so cancer is now an excuse to be horribly stoned :)

almost makes up for the lethal factor
 
i have asthma n if i feel like my lungs are gettin tight then i take a hit of pot n i can feel them opening up because its a broncalur inhibitor???, basicly it causes ur shit to expand
 
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