[undercoverbrother]

Originally Posted by HOOT

Myth! Just like one joint is worse than a pack of cigarettes. Any time you inhale smoke it is not going to be good for you, doesn't matter if it's the grass in your front lawn.

But there has been studies showing that even though cannabis has a higher concentrate of harmful ingredients it also has THC which combats those effects of lung cancer. It has something to do with the receptors in the lungs only 'connecting' to tobacco smoke.

It's even been shown that THC can block cancerous cells from growing. I know right now there is a study going on where they are injecting THC for brain tumors and are seeing success with them shrinking.

Be even your source isn't sure:

http://www.webmd.com/smoking-cessati...health-effects

Spoiler!

"Putting smoke in your lungs is not good for the lungs," says Roland Lamarine, HSD, professor of public health at California State University, Chico. He reviewed published studies on the health effects of marijuana earlier this year for the Journal of Drug Education.
Smoking marijuana produces a nearly threefold increase of inhaled tar compared with tobacco, according to some studies. Other research suggests that marijuana smokers, compared to cigarette smokers, inhale more deeply and hold their breath longer.
"There are still questions that aren't answered about lung damage," Lamarine says. For cigarette smokers who also smoke marijuana, there may be an additive effect, he says.
Combining the two appears to be a trend, he says. "Some of the [college] kids tell me they buy cigars and put in some marijuana, so there is both marijuana and tobacco," Lamarine says.
Marijuana smoke contains cancer-causing substances, according to the National Institute on Drug Abuse. Some research shows that marijuana smoke has up to 70% more cancer-causing substances than tobacco smoke, it says.
"Nobody is advocating that routinely inhaling carcinogenic smoke is healthy," says Paul Armentano, the deputy director of NORML (National Organization for the Reform of Marijuana Laws).
However, he says, many marijuana users these days have turned to alternate delivery methods, such as oral, tinctures, and vapor forms. In research, he says, the vaporized forms have fewer adverse chemicals than the inhaled form.
Those who keep marijuana use light do not appear to lose lung function, according to a 2012 study in the Journal of the American Medical Association.
Researchers compared tobacco and marijuana users. Tobacco use was associated with lower lung function, and the function got worse as smoking levels increased.
For the study, low levels of lifetime exposure to marijuana, defined as one joint a day for seven years, did not show evidence of adverse effects on lung function. The study does not confirm these findings with heavy users.

Is it possible that more study needs to be done? My only concerns is, I wonder if there is the ability to do an independent study anymore. Both side are strongly entrenched.

In fact a quick google search shows that you can find studies that support both sides, but they come from entities that support the findings of the study.