When you say "real science", is that Western science/medicine your referring too?
Modern medicine is what 200 yrs old or so give or take?
Chinese/Hindu/ Native Peoples folk medicine has been around since the dawn of man.
Right now there are teams of experts from every medical field and drug company in the rain forests, consulting Native peoples on the healing properties of their traditional medications.

Just becasue modern science can't explain it, run tests on it doesn't mean it doesn't work.
They've been doing major surgery in China, including brain surgery using just acupuncture to anesthetize the patient. They ( the Chinese) are talking meridians of energy/chi, something which modern science can't measure and many believe is just snake oil medicine.

The native people of every culture have a rich heritage of folk medicine that they've used for centuries.
Some is based on the power of believe/ placebo effect, but much is based on herbal formulas past down for generations.

Even that pot you like so well has reputed medical effects although many western doctors don't believe it or the "science" hasn't shown it to western sciences satisfaction.

Western medical doctors know a lot of things but they don't know everything and the more enlightened ones are realizing that more and more everyday.

Ever watch the Dr. Oz show?
He has segments every show about the healing properties of foods and herbs that are now just getting modern medicines attention.

It's the ultimate in egotism to think that a system of medicine that is really just in it's infancy compared to other forms of healing is superior in every case or the other systems are inferior just because that so called "science" hasn't figured a way to study them properly.