Actually Magickor, marijuana doesn't gunk up your lungs with carbon dioxide. You're confusing that with tobacco. Marijuana is a plant with THC. It really doesn't kill you health-wise. Just like Taliesin said, you can die by getting high and going out by having an accident, but weed does not give you any kind of lung cancer. To put in perspective, think about smoking a peppermint leaf. No, it does not give an effect, but the concept of smoking a leaf. It just... Just does not hurt you like that.
I remember my father used to smoke marijuana with an air purifier in the bathroom...Which makes me laugh because we all knew what he was doing in there.
And well when it purifies the air whatever is in the air sticks to this metalic filter that you would clean with a wet cloth. Very easy to clean.
But it wasn't until he started taking it into the bathroom that a tar like substance (that was very hard to clean off by the way)started sticking to the filter. My guess would be burning anything and inhaling the smoke would cause the same effect.
But he's been smoking for 30 years now and he's fine.
keep in mind with Maraijuana most of the time you know what your smoking. With Tabacco who knows what's in it.
From what I've read there has been very little research done on the effects of cannabis on the lungs, mainly because its rather difficult to find someone who has only been exposed to cannabis smoke. All of my friends who smoke cannabis do so along with tobacco, and one thing is for certain, tobacco is harmful to your health.
With regards to magical practice, in my opnion cannabis most often becomes a crutch for the practitioner, hampering them form achieving their full potential. While there are those who use it to great effect in their path, those seem to be few and far between. I would definitely think long and hard before introducing such an element to your craft.
Crowley actually wrote on that very topic. I don't recall where he said this, and I'm on a trip so I can't check my library, so if anyone knows where the heck he said this please let me know.
He advocated drug use as a way to achieve altered states of consciousness, but stated that your goal should be to reach a point where the mere sight, smell, or even thought of the drug is sufficient to produce this state.
On the topic of general marijuana health, yes it will totally put a tar-like substance in your lungs. On the plus side, it's incredibly easy to get out. Whereas tobacco tar is incredibly stubborn and can take years of non-smoking to dislodge and cough up, most sediment left by marijuana smoke is caught in phlegm and coughed up easily. I use medicinal marijuana to prevent the worsening of an auto-immune disease and help alleviate its symptoms. Even after heavy use it only took around three days of non-use for my phlegm to go back to normal. I know several pot smokers, including a few who are aged over 50, and and it has shown no signs of impairing their health or diminishing their lung capacity.
If you're really worried about getting smokey sediment in your lungs, but are still interested in inhaled marijuana (as opposed to eaten marijuana, which places greater emphasis on a body-high rather than a head-high) you can try a vaporizer. It heats up the marijuana, activating and releasing the THC in a vaporous form which you inhale and hold like smoke. While chemicals like THC are inhaled, solids as with smoke are not produced unless you scorch the marijuana by leaving the heat too high or leaving the cannabis in the heated chamber too long. This is a good choice for one who wishes to use cannabis, but who is irritated or sickened by smoke.
Good vaporizers cost more than $100, but you can get a functional cheap one in the $30-$50 range. My only warning with cheap ones is to start on a very low temperature and slowly work your way up. Sometimes the heat control on cheap ones aren't accurate and too low a heat just accomplishes nothing, whereas too high a heat burns cannabis and produces smoke.
And just a side note on health impacts, the following also have detrimental health effects, some of them greater than those offered by cannabis, but without the health benefits;
* The artificial lighting level in most schools and offices,
* The amount of sitting done in the average Western day,
* The radiation absorbed from flight in an airplane,
* High fructose corn syrup,
* Pooping in a sitting position,
* Fried anything.
We act as if marijuana is some evil boogey-man in a world otherwise free from any sort of negative health ramifications. Just because it's relevant to pretty much everyone on the site, here's the source on sitting killing you (http://opinionator.blogs.nytimes.com/2010/02/23/stand-up-while-you-read-this/?hp) and sitting toilets causing hemorrhoids in freaking half of Americans (http://www.slate.com/articles/health_and_science/science/2010/08/dont_just_sit_there.html).
With all the other things screwing up our health, why are we so up in arms about pot? Food (and munchies) for thought, yo.