Forest Bathing Scientifically Validates The Cannabis Entourage Effect

Introduction

The extensively-studied phenomenon known as “Forest Bathing” in Japan and South Korea and as “Kneipp Therapy” in Germany involves exposure to high concentrations of naturally-occurring aerosolized phytochemicals in conifer & deciduous forests.

This natural treatment for conditions ranging from asthma to dermatitis has been documented and validated by a raft of high-quality medical and scientific research.

There is no question that “Forest Bathing” has therapeutic benefits. For example, positive effects on NK (Natural Killer) cell activity have been shown with in vitro treatment of tumor cell lines with monoterpenes released from trees (and of course present in Cannabis flowers) such as d-limonene and α-pinene, and also in forest bathing trips. The anti-tumor effects act by increasing intra-cellular levels of anti-tumor proteins such as perforin, granulysin, and granzymes A/B.

Haven’t heard of “Forest Bathing”? I hadn’t either until I ran across it during some intense research into naturally-occurring environmental Cannabis terpene aerosols. The ancient Japanese natural health practice called “Shinrin Yoku”, defined as “taking in the forest atmosphere” or “forest bathing”, has a wide range of rigorously tested and proven health benefits.

In 2005 the Japanese government introduced a nationwide “Therapeutic Effects of Forests Plan” that pays “Forest Bathing” health benefits. The government says that it pays for this therapy because of the proven reduction in other health care costs across the spectrum.

South Korean scientists and public health researchers have documented a wide range of positive health benefits from exposure to terpenes in the air of coniferous forests, with variations among the terpenes in different species of trees at different locations accounting for differences in the health benefits of inhalation of forest air.

They have divided the country into numerous micro-climes where particular combinations of coniferous tree species co-exist and perfume the air, each location offering a particular healing, stimulating mix of terpenes and other phytochemicals.

Interestingly, the dominant terpenes in the air of these forests are the same terpenes that characterize different Cannabis strains and the same kinds of variability in Cannabis strains similarly account for their differing health benefits.

There is also a natural medicinal therapy in Germany called “Kneipp Therapy”, that involves a series of exercise routines done in a terpene-rich forest environment. Kneipp Therapy has been studied using quality clinical research protocols and the exercises have been found to be significantly more beneficial when performed in a forest environment compared to other kinds of locations. 

So, it’s both very interesting and very significant for establishing the validity of the Cannabis “Entourage Effect” that the dominant terpene profiles of all of the therapeutic forests studied in the Japanese and Korean “Forest Bath” scientific literature (cited below) appear to be various combinations of myrcene, pinene, limonene, linelool, and a number of less-celebrated but still important Cannabis terpenes like cynene, terpinene and boneal. There are many other “minor” phytochemicals shared between the airborne perfumes of Cannabis flowers and therapeutic forests, and almost certainly many of these will ultimately be shown to play significant roles in both the Forest and the Cannabis “Entourage Effect”.

Bottom line – I believe that there is an inescapable argument in favor of the Cannabis “Entourage Effect” presented by the “Forest Entourage Effect”, which itself is definitively established in international, if not US, scientific and medical literature.

Discussion:

There has been extensive research in multiple advanced countries on the health benefits of exposure by inhalation and skin absorption to the airborne terpenes in forest environments – interestingly enough, these turn out to be the same terpenes that are inhaled in the vapors from Cannabis flowers.

“Forest Bathing” research establishes that inhaling a naturally-occurring mix of terpene emissions or vapors has far greater health benefits than exposure to or ingestion of any of the terpenes and other phytochemicals singularly, like in a pill or other oral or topical medication.

Cannabis visionaries have always known that the THC was only one element of the sensual pleasures and only one of the sources of health benefits from the sacred flower, just as wine lovers have always known that the alcohol is only a relatively small part of their total experience. Nobody drinks a bottle of Etude Pinot Noir or Chateau Pomerol Bordeaux for the alcohol, and nobody chooses which Cannabis flower to enjoy simply on the basis of THC content, although that approach seems to dominate much of today’s adolescent-style Cannabis marketing. Even the most dedicated couch-locked stoner knows very well that there is a world beyond THC and may spend a lot of time (if they’re not too ripped)  thinking about taste and aroma options when they’re choosing between Durban Poison and Granddaddy Purple.

However, the concept of a Cannabis “Entourage Effect” has been universally ridiculed by anti-Cannabis forces who say that the supposed variety of effects of different Cannabis strains is simply a kind of mass delusion.  They claim that there is no evidence that different phytochemical profiles of different Cannabis strains signal different health and well-being effects, and say that in their expert, informed scientific opinion such observations are imaginary. While their criticisms are couched in the careful, apparently rational language of science, and even rated a major article in Scientific American in 2017, all of the criticisms amount to a simple “It’s all in your head” dismissal.

In other words, the anti-Cannabis establishment says tough, there’s no scientific evidence to support your claim, and there’s not going to be any evidence either because we aren’t going to fund research.

Well, I’ve got some news for these die-hard prohibitionists.

OK, they have managed to impede research that could validate many of the medical benefits of the whole Cannabis Flower as opposed to plain old THC extract. With notable medical research exceptions, many of the health and sensual benefits ascribed to the Cannabis Flower are currently only validated by experience and consensus, both of which the scientists are fond of reminding us can be way off target. They point to the flat earth delusion, or to many other instances where “everybody knows” something that simply isn’t true, and smugly point out that nobody can prove all these marvelous things we’re saying about Cannabis.

It’s hard to find a reasonable explanation of why the Federal government has arrayed its dark-side powers against the Cannabis flower, but in this match between the Flower and the Power it’s beginning to look like the Power is going to lose this one because Forest Bathing research actually provides plenty of evidence . The research unequivocally supports the validity of the “Entourage Effect” by demonstrating that naturally-occurring environmental terpene and phytochemical aerosols do have measurable, verifiable positive impacts on overall health as well as on specific diseases and conditions, and do vary among forest tree species and environments in the same ways that Cannabis flowers vary among strains in response to environmental variables.

Forest Bathing research is directly applicable to validating the “Entourage Effect” of Cannabis terpenes and phytochemicals that are widely observed but, according to the Federal propagandists,  not “scientifically verified”. As an example, there is solid research that says that terpene emissions from plants are directly correlated with the concentration of terpenes in the plant. The higher the concentration of terpenes, the greater the emissions from the plant. “Forest Bathing” research naturally focuses on terpene emissions from coniferous and to a lesser degree deciduous trees, but the relationship between terpene concentrations and emission rates has been widely replicated in studies with agricultural crops and seems to apply to all plants.

The bottom line is that clinical literature as well as popular wisdom in several countries points to the health benefits of inhaling and “bathing in” an atmosphere rich in terpenes and other phytochemicals. While the health benefits of many of the individual components of this phyto-soup are only recently becoming well-known, the benefits of exposure to the entire environmental complex of a pine/conifer forest are familiar to anyone who has ever walked outdoors that first morning in a forest campground.

A recent study concluded: “Exposure to natural environment is beneficial to human health. Among environmental exposures, the effects of forest have been emphasized in many studies. Recently, it has been shown that a short trip to forest environments has therapeutic effects in children with asthma and atopic dermatitis. Based on these studies, healthcare programs to use forest have been developed in several countries. Forest bathing has beneficial effects on human health via showering of forest aerosols. Terpenes that consist of multiple isoprene units are the largest class of organic compounds produced by various plants, and one of the major components of forest aerosols. Traditionally, terpene-containing plant oil has been used to treat various diseases without knowing the exact functions or the mechanisms of action of the individual bioactive compounds.”

So, it’s clear that relaxing for a few hours in a forest environment filled with terpenes can be beneficial and even therapeutic for people with a wide range of diseases and conditions from dermatitis to cancer. Do a simple internet search for “forest bathing’ and you’ll find books, resorts, videos and even classes. But enter “cannabis bathing” into a search and you’ll get bath salts, bubble bath, and a lot of fruit-flavored massage and lubricating oils.

For the past year or so I have been exclusively using a vaporizer to enjoy Cannabis flowers and I can add my experiences to the observations of many others that whole flower Cannabis vapor is a marvelous clean, natural high which, now that I realize it, is almost exactly like stepping out of my tent high in the pine forests of the Oregon Cascades and inhaling that first breath of vibrant, aromatic, high-energy mountain air.

So in my opinion all this research on “Forest Bathing” makes the smug “You can’t prove it and we’re not going to let you” chant of the anti-Cannabis “scientists” pretty much irrelevant. Sooner or later there will actually be research on every aspect of inhaled and absorbed Cannabis terpenes and other phytochemicals but until then the parallel research on Forest Bathing should be more than adequate scientific evidence for any reasonable person of the validity of the Cannabis “Entourage Effect”.

Selected Bibliography

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Tsunetsugu Y, Park BJ, Miyazaki Y. Trends in research related to “Shinrin-yoku” (taking in the forest atmosphere or forest bathing) in Japan. Environ Health Prev Med. 2010;15:27–37. doi: 10.1007/s12199-009-0091-z. [PMC free article] [PubMed]

Seo SC, Park SJ, Park CW, Yoon WS, Choung JT, Yoo Y. Clinical and immunological effects of a forest trip in children with asthma and atopic dermatitis. Iran J Allergy Asthma Immunol. 2015;14:28–36. [PubMed]

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Li, Q., Kobayashi, M., Wakayama, Y., Inagaki, H., Katsumata, M., Hirata, Y., Hirata, K., Shimizu, T., Kawada, T., & Park, B. (2009). Effect of phytoncide from trees on human natural killer cell function. International Journal of Immunopathology and Pharmacology, 22, 951–959.

Li, Q. (2010). Effect of forest bathing trips on human immune function. Environmental Health and Preventive Medicine, 15, 9–17.

Ormeño, E., Gentner, D. R., Fares, S., Karlik, J., Park, J. H., & Goldstein, A. H. (2010). Sesquiterpenoid emissions from agricultural crops: correlations to monoterpenoid emissions and leaf terpene content. Environmental Science & Technology, 44, 3758–3764.

Park BJ, Tsunetsugu Y, Kasetani T, Kagawa T, Miyazaki Y. The physiological effects of Shinrin-yoku (taking in the forest atmosphere or forest bathing): evidence from field experiments in 24 forests across Japan. Environ Health Prev Med. 2010;15:18–26. doi: 10.1007/s12199-009-0086-9. [PMC free article] [PubMed]

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