To everyone who makes the absolute statement "marijuana won't give you lung cancer," you need to learn some things about absolutes in medical science. There are none. And so you can't say that absolutely.

The research shows that THC and the other cannabinoids have good anti-cancer protective effects. But there haven't been any in-depth, lasting studies done over decades with thousands of subjects to prove there's absolutely no cancer risk. You don't know, for instance, that cannabis doesn't set in motion DNA changes in folks who, say, had earlier exposure to chemicals or particles like radon, asbestos, pollution, or second-hand smoke which may hasten the later development of pulmonary cancers in those people. You don't know that the other carcinogens in cannabis smoke won't cause cancers in certain elements of the population. You can't say for sure that people who've spent an entire lifetime smoking pesticide-laced Mexican schwag won't develop lung cancer. You can't say that inadequately flushed hydroponic cannabis won't cause cancer in certain groups.

The bottom line is you don't know how different bodies will respond to cannabis smoke because every single body is unique and responds differently to different substances.

So as nice as it sounds to make those absolute statements, the only people you're fooling is yourselves and some of the very gullible, uninformed, non-scientifically inclined kids out there who want to believe the black-and-white it's-all-good health absolutes. By doing that, you're doing yourselves and others a great disservice.