You have to select a Speciality and a Category. You can also select a sort order, and even specify individual search criteria for certain details. Not everything causes cancer, but there's a long and growing list of suspected agents. Here's the word from the International Agency for Research on Cancer and the U.S. National Toxicology Program on dozens of known, probable and possible carcinogens. Read it and weep.
Many people find acupuncture useful in relieving intractable pain and other health conditions.
A cornucopia of government information. The possibilities are endless at this USDA site that calculates the nutritional value of foods. Ask for carrots and it offers you 23 different kinds. Helps to dispel many myths. The Tumor Board is highly regarded, but not for everyone.