I stick by what I said, but I don’t think people are responsible for giving themselves illness. It’s a useless attitude that just adds further negativity and interferes with healing. When I was a medical student in the late ’60s, I’d ask women I saw in hospitals with breast cancer why they thought they got the disease. They’d respond, “Twenty years ago I hit my breast against the kitchen table,” or “I was in a car accident, and my breast was injured.” Yet we know of no connection between trauma and breast cancer. When I ask women today why they think they developed breast cancer, they say things like “I bottled up my anger against my husband for all those years.” But there is also no evidence that not expressing emotions is a factor in breast cancer. It’s an interesting shift, however, because if you think you developed cancer because of an accident, that was beyond your control. If you think you got it because you did not express emotions, this is a failing on your part. And that’s a big difference. This appears to be a result of all the New Age writing about attitude and cancer. And I don’t think it is helpful.

What is your general take on medicine in the year 2007? How do you feel the current health-care system in the United States needs to be changed?

Firstly, we don’t have a health-care system. We have a disease management system that doesn’t work. Medicine has to change. The basic mistake made is that we are not addressing prevention. Instead, the focus is on interventions. And those interventions are heavily dependent on expensive technology, of which pharmaceutical drugs are a major category. We have ignored, and don’t teach in most medical schools, the simpler and low-tech methods that previous generations used and other cultures still do. For example, I teach most patients simple breathing techniques that come from yoga, which I have found to be strikingly effective for an incredible range of conditions, from heart arrhythmia and high blood pressure to chronic digestive problems, such as irritable bowel syndrome and reflux disease. These breathing techniques take no time, they need no equipment, they are free. And they work very efficiently. It is just one example outside the world of conventional medicine that if brought into the mainstream could improve our health and lower costs. And this is what integrative medicine is attempting to do.

What are your thoughts on the new book How Doctors Think and the debate about how physicians make diagnoses and why they are such poor communicators with their patients?

I think many people are experiencing this today, and this is what we are trying to change. We have developed a new curriculum to train a different kind of physician. I really think that is the answer. The University of Arizona’s program is a leader in this. But there are now 35 other medical schools in the United States and Canada that have joined an academic consortium for integrative medicine. There is a real movement in North America, and it’s beginning to happen elsewhere as well.

You’ve said that there is a lot that conventional medicine does well—that if you were in a car crash, you wouldn’t want to be taken to an herbalist. But you’ve also said you would not consult the medical profession if you had cancer or hypertension or arthritis. Do you still believe this?

Regarding cancer, I would have to change that; it was written some time ago. Most cancer patients I do refer to conventional treatment, and then I suggest things they can do to reduce toxicity and increase efficacy of therapy. For hypertension, I would try lifestyle measures first: losing weight, exercise, eating more vegetables, taking calcium and magnesium supplements, practicing some kind of relaxation technique, like breathing work, and monitoring blood pressure several times a day and keeping a record. If, after six to eight weeks, you can’t get your blood pressure down sufficiently, then I would recommend the lowest dose of the mildest agent. Arthritis is made to order for integrative medicine because there are many approaches that should be emphasized first—an anti-­inflammatory diet and herbs like ginger and turmeric, water exercise, hypnosis or guided imagery, possibly Chinese medicine—before the selective use of pharmaceuticals.

You are arguably America’s foremost practitioner of alternative or integrative medicine. How and why did you become the poster doc in this field?

Several reasons. One is I have very good credentials. Another is that I have a balanced view. I don’t reject conventional medicine, I don’t accept all alternative medicine, and I’m not trying to promote any particular system. Third, I am a trained writer and good communicator, which is rare in this field. Fourth, over 35 years I’ve built up a very credible track record. People have confidence in my recommendations. And things I’ve written and said have proved true with subsequent research.

What did this mean for you in terms of leaving old thinking and medical or allopathic colleagues behind?

I never practiced allopathic medicine. When I got out of my clinical training, I felt I had not been trained to do prevention, which was what I was most interested in. I also felt that the methods I learned were too dangerous to be used generally. So from that early time, I began investigating other ways and putting together what I first called “natural and preventive medicine.” At the beginning, it was rather lonely. I knew I was on the right path and I was doing what I was supposed to do. I was just completely ignored by medical colleagues. And while I’ve never practiced allopathic medicine, my program receives grants from the National Institutes of Health.

The medical establishment has charged that you can cite only anecdotal evidence, not clinical trials, to support your recommendations. How do you respond?

There is a lot of evidence out there that the medical establishment just doesn’t pay attention to. Secondly, what I teach and how I practice is that we should use a sliding scale of evidence: The greater the potential of the treatment to cause harm, the stricter the standards of evidence should be. A lot of what is done in conventional medicine is extremely harmful and does not have solid evidence behind it.

Written when you were a student at Harvard, your exposé for The Crimson on LSD’s being supplied to students was instrumental in Professor “Turn on, tune in, drop out” Timothy Leary’s being forced out. Later, after your own experiments with marijuana, you went on to conclude, “There are no good or bad illicit drugs, just good or bad uses.” What would the good uses be?

There is an enormous range—everything from relaxation, as we do with alcohol, to exploring mind-body events like healing, to stimulating creativity, to social connection. I look at what people do. I’m not trying to tell people to do drugs or not do drugs. I have a whole book on this subject called From Chocolate to Morphine. But it is stupid to cut ourselves off from marijuana as a medical drug, as we do in this country, because it is so nontoxic compared with pharmaceutical drugs. And it has many interesting uses. Similarly, there are poor pain-control methods in this country. In England, for example, doctors can use heroin as a pain control method because it has some advantages over morphine. There is so much irrationality in U.S. drug policy. It is completely rooted in fear and superstition and really has nothing to do with the scientific facts. Yet the drugs that we encourage and promote the use of and make money from, such as alcohol and tobacco, are, in any way you look at it, the most dangerous medically and in terms of addictiveness and social costs. In my youth, in the ’60s, I used marijuana and psychedelics. These days, I don’t. I’m a moderate consumer of alcohol. I drink green tea moderately. I like dark chocolate.

You’re 65 and often described as cherubic, a polite way of saying a little chubby. You admit to liking chocolate. Are you really following your own advice?

Absolutely! I don’t think you’d find me chubby now. A lot of that was the legacy of the book tour that I went on, eating on the road all the time. It took me about a year and a half to recover. I will never do that again. And I do not tell anyone to do anything that I do not do myself.

Last year, you were criticized by the Center for Science in the Public Interest [CSPI] because you sell the supplements you promote in your books and on your Web site. They also cited your $14 million deal with Drugstore.com.

I began selling supplements for several reasons. One was selfish: I wanted access to products that fit my specifications, and I couldn’t find them out there. Secondly, I was besieged by readers who wanted me to direct them to products that fit my standards. And thirdly, and most important, it was the only way that I could see to fund the academic work that I do. Our program at the University of Arizona has a $4.5 million annual budget. We depend on a lot of private philanthropy. It’s been tough. And by creating my foundation, which receives all of my after-tax profits from these products, there is now the beginning of a steady revenue stream to support the program and other programs around the country.

CSPI also claimed that only a little of the money you earned on supplements actually goes into your program or foundation, even though you’ve stated otherwise.

The Weil Foundation gave away half a million dollars last year. This year, we expect it to be 1 million dollars, and in the near future, many millions of dollars. I was really angered by that story. There were a lot of inaccuracies in it. And I think it was mainly motivated by the center’s antisupplement bias. There is nothing to hide. The money from the supplement sales flows through to the program and the foundation. And anyone is welcome to look at it.

Why do you think the public is so intrigued by medical mysteries, like the TV series House or DISCOVER’s Vital Signs?

Clearly, people are obsessed with health. It is the number one topic on everybody’s list. I think this was probably always the case. But in addition, commentators have written that physicians in our culture have filled the role of priests and shamans in pretechnological societies. We invest them with the same kind of belief and power. And even though we may be very unhappy with today’s whole system with doctors, I think that’s still there.

What’s next for you? Do you plan to retire? And since your daughter, Diana Dakota Weil, is writing columns on your Web site, are you grooming her to take over?

My daughter wrote four columns for my Web site, and I hope she will do more of them. She’s only 15, and she thought she might want to be a journalist or a writer. So I encouraged her to write some columns for my Web site from a kid’s point of view. Unfortunately, she’s been too busy to continue.