Among the more interesting pieces of news that came out while I was on vacation the first half of August was a new study in the journal Cancer Prevention Research, which found that marijuana smokers have a lower risk of head and neck cancers than people who don't smoke marijuana. Alas, this important research has been largely ignored by the news media.

While this type of study cannot conclusively prove cause and effect, the combination of this new study and existing research -- which for decades has shown that cannabinoids are fairly potent anticancer drugs -- raises a significant possibility that marijuana use is in fact protective against certain types of cancer.

A team of researchers from several major universities conducted what is known as a "case-control" study, comparing patients who had squamous cell carcinoma of the mouth, larynx, and pharynx with control patients matched for age, gender, and residence location who did not have cancer. By looking at matched groups with and without cancer, researchers hope to find patterns indicating risk or protective factors. In this case they focused on marijuana use, but also took into account known risk factors for this type of cancer, including tobacco and alcohol use.

After adjusting for those confounding factors, current marijuana users had a 48% reduced risk of head and neck cancer, and the reduction was statistically significant. Former users also had a lower risk, though it fell short of being significant. The investigators crunched the numbers several different ways -- for example, by amount of marijuana used or the frequency of use -- and the findings stayed the same nearly across the board, with moderate users showing the strongest and most consistent reduction in cancer risk.

The scientists write, "We found that moderate marijuana use was significantly associated with reduced risk HNSCC [head and neck squamous cell carcinoma]. The association was consistent across different measures of marijuana use (marijuana use status, duration, and frequency of use)."

Strikingly, among drinkers and cigarette smokers, those who also used marijuana reduced their cancer risk compared to those who only drank and smoked cigarettes. So marijuana may actually have been countering the known bad effects of booze and cigarettes.

This is important, and by any reasonable standard, it's news. But this afternoon, a Google News search for coverage of this study produced a grand total of nine hits. None of these -- none -- was from a major newspaper, wire service, or TV network.

A huge wildfire ablaze in  Santa Barbara County over the last week has been linked to a clandestine marijuana grow operation in the Los Padres National Forest. As we often point out, prohibition is to blame for these destructive illegal gardens because it leaves this popular agricultural product in the hands of criminals with no regard for the environment instead of legitimate farmers.

Orange County Register columnist and author of "Waiting to Inhale, the Politics of Medical Marijuana" Alan Bock writes in his blog post that the proliferation of these sites on public lands is a result of misguided asset forfeiture laws:

So it’s not surprising that faced with the loss of property whether a crime was proved against them or not  or charges were even filed, marijuana growers began to use land that they didn’t own and couldn’t be seized. The best bet was not some poor innocent’s land, but government land, of which there is more than an abundance in the western states, which couldn’t be forfeited because the government already owns it. So the national forests became the preferred venues for large marijuana grows, the forests were in some cases degraded and became less useful to the public they were supposed to benefit — and now we have a major wildfire allegedly started by marijuana growers.

To their great credit, the editors at Forbes.com offered us the opportunity to respond today to last week's absurd column by Rachel Ehrenfeld. Enjoy.

Sometimes the only appropriate response is to laugh out loud. Forbes.com columnist Rachel Ehrenfeld has discovered that the National Institute on Drug Abuse is presently soliciting proposals from a contractor to grow marijuana for research and other purposes.

Apparently unfamiliar with The Google and other search tools available on the Intertubes, Ehrenfeld actually thinks this is part of "Obamacare," and the fact that NIDA is "venturing into the marijuana cigarettes production and distribution" is the evil brainchild of George Soros, the pet villain of prohibitionists and other reactionaries.

Oh dear. That the federal government has been distributing medical marijuana to a small group of patients for more than three decades seems to have escaped her notice. So has the fact that, under present (thoroughly dysfunctional) rules, scientists doing clinical research on marijuana must obtain the marijuana for testing from NIDA, along with the fact that for most of that time the government has contracted with the University of Mississippi to produce marijuana for this purpose.

Poor Rachel rants about how studies have supposedly documented adverse effects of marijuana and fails completely to notice the wealth of research that documents medical efficacy and safety -- not to mention the vast array of medical and public health organizations that have recognized marijuana's medical potential.

Nah, it's all a conspiracy, with evil George Soros pulling Obama's puppet strings.

Rachel, call us when you return to planet Earth.

The Drug Enforcement Administration and local law enforcement raided two Los Angeles area medical marijuana dispensaries today. Only limited information is available so far, but MPP will be watching the situation closely.

Drug czar Gil Kerlikowske offered a correction on Friday to the erroneous comments he made regarding marijuana’s medical value. His new statement, however, is nearly as problematic as the old.

Last month, the drug czar told reporters that marijuana “has no medical value.” During a follow-up interview with KOMO-TV in California on Friday, he corrected that statement:

Sometimes you make a mistake and you work very hard to correct it. That happens. I should’ve clearly said ’smoked’ marijuana and then gone on to say that this is clearly a question that should be answered by the medical community.

Kerlikowske continued, saying, “The FDA has not determined that smoked marijuana has a [medical] value.”

While it’s refreshing to see a drug czar who is capable of admitting a mistake, his new statement still falls short of an honest assessment of marijuana's medical value. The FDA’s position on medical marijuana (which is derived from a statement the agency released in 2006) is largely political and was rejected by the medical community following its release. The FDA ignored the government’s own report, published by the Institute of Medicine in 1999, which states, “there are some limited circumstances in which we recommend smoking marijuana for medical uses.”

Numerous studies have found specific medical uses for smoked marijuana, and some of the most interesting research has been done since the FDA released its statement in 2006. Several studies from the University of California, for example, have found that marijuana is highly effective at treating neuropathic pain, a type of nerve pain for which traditional pain medications are notoriously inadequate.

The drug czar's correction falls short.

The House sponsor of Rhode Island's medical marijuana law, Rep. Thomas Slater, passed away today after a long battle with cancer.  In addition to championing the needs of seriously ill patients who could benefit from medical marijuana, he was the tireless advocate of the needy in his district, from driving elderly constituents to the pharmacy or supermarket to sponsoring legislation for health care for uninsured children and affordable housing. In June, the Providence Journal published a moving profile of this amazing man, which you can read here.

Despite being ravaged by cancer, Rep. Slater continued to trek to the legislature this summer to ensure the passage of a bill to add nonprofit dispensaries, or "compassion centers," to the The Edward O. Hawkins and Thomas C. Slater Medical Marijuana Act. The initial law allowed patients or their caregivers to grow marijuana, but many testified that they risked violence buying their medicine on the streets. Rep. Slater's heartfelt efforts paid off: His colleagues in the House unanimously voted to override Gov. Carcieri's veto of the bill, and they then gave him a standing ovation. Three years earlier, they had voted to name the medical marijuana law in his honor. Only Rep. Slater voted against this gesture.

Rep. Slater will be deeply missed. But his legacy will live on. Thanks to his leadership, more than 500 seriously ill patients in Rhode Island can now use their medicine without fearing arrest. And, by the new year, the state will have registered a nonprofit to provide regulated, safe access to their medicine.

I've been absent from this blog for a couple weeks, taking a much needed vacation and trying my best not to think about marijuana policy. While away, I did what I usually do when I need to clear my head: I read some Mark Twain -- in this case a collection of his topical writings, some too incendiary to be published during his lifetime.

And Twain, damn him, got me thinking about marijuana policy.

In a piece called "Corn-Pone Opinions," first published 13 years after his death, Twain observes, "I am persuaded that a coldly thought-out and independent verdict on a fashion in clothes, or manners, or literature, or politics, or religion, or any other matter that is projected onto the field of our notice and interest, is a most rare thing -- if it has indeed ever existed. ... we shall merely conform and let it go at that. We get our notions and habits and opinions from outside influences."

Twain's essay was written many decades before public opinion polling showed that, once the results of an election are known, a far higher percentage will say they voted for the winning candidate than actually did so. As a race, we like to follow the pack and not stray too far from what we believe our friends and neighbors think.

And that tendency is what makes possible what Twain calls in another essay "the silent and colossal national lie that is the support and confederate of all the tyrannies and shams and inequalities and unfairnesses ..." Such lies, he explains, are rooted not in what is said, but what is unsaid -- by, for example, the millions of Americans who, when Twain was a child, knew slavery was wrong but said nothing. By silently acquiescing to what they thought was the majority sentiment so as not to stand out from their neighbors, they enabled a massive evil to be perpetuated for decades.

And so it is with our war on marijuana, an evil that persists because most of us silently go along with the colossal, national lie that the criminalization of tens of millions of our fellow citizens -- and the arrest of over four-fifths of a million of them each year -- is accomplishing something worthwhile rather than spreading injustice through every facet of society.

The answer -- the only answer -- is to break the silence. End the lies -- and not just on this blog or drug policy listserves or other forums for the converted. We need to speak up at every opportunity -- at work, at PTA meetings, at the barbershop, with friends and neighbors and co-workers. Even when it's awkward. Especially when it's awkward.

So how was your summer vacation?

Scott Turner, a New Hampshire medical marijuana patient who made headlines during the presidential primaries when he got then-Sen. Obama to promise to end federal interference in medical marijuana states, died Aug. 4.

Scott, who suffered a long, painful battle with degenerative joint disease and a degenerative disc disease, was a great friend to MPP and a tireless advocate for the rights of patients to use medical marijuana without fear of arrest.

Most recently, he was involved in the fight to pass a medical marijuana bill in New Hampshire, which was vetoed by the governor after legislators scrambled to pass a bill they had reworked to his specifications.

We here at MPP will miss Scott dearly, and we offer our sincerest condolences to his wife and family. We'll continue your work, Scott, and make sure the New Hampshire legislature overrides Gov. Lynch's veto and ensures no seriously ill Granite Stater ever has to endure what you endured just to treat your pain.

Here's Scott back in August 2007, securing Obama's support for the rights of medical marijuana patients, which led the Obama administration to announce its historic policy change earlier this year:

Two weeks ago, when drug czar Gil Kerlikowske told reporters that “marijuana is dangerous and has no medical benefit,” he also repeated a line he’s been using since taking the job as director of the Office of National Drug Control Policy: "Legalization is not in the president's vocabulary, and it's not in mine."

This oft-repeated line (see an example here) is concerning to those of us who want President Obama making informed decisions about our nation’s marijuana policies. How can he discuss its merits if he doesn’t know the word?

To solve this problem, MPP has created a Web page that allows you to e-mail President Obama the definition.

Click here to define “legalization” for President Obama.

It also lets you add a message about why you support ending marijuana prohibition. Go ahead and take action today, and help MPP arm President Obama with the knowledge he’ll need to make an informed decision about the future of America’s marijuana laws.