You were given bad information. A negative pap has nothing to do with HPV. The histology of the PAP smear is looking for dysplastic cells (those not normal, but on their way to becoming malignant) and outright malignant cells, usually SCC just as in oral cancer. As to all the other possible causes of cancers; the list is long. Nothing that you have mentioned stands out as a definitive culprit, and you cannot live your whole life worrying about every POSSIBLE agent that may wreck havoc on your body. While everything that you have mentioned has gotten some bad press at one time or another, there is a distinct difference in bad PR and definitive proof that something causes cancer. If it did it wouldn't be on the market. Even those things which we know to be harmful, like the carcinogens in tobacco, don't affect everyone. We all know someone who has smoked his or her whole life long and didn't get cancer. Granted they may be a minority, but it goes to show that we are all unique individuals and what impacts one body doesn't hurt another. The list of potential harmful agents around us would take thousands of pages to list. Start with the pollution in the air we breath, the chemicals in the foods we eat, and so much more. To look at a singular source of malignancy and try to avoid it only works in those agents that have the most toxic effects. As to the millions of others, perhaps their acting in concert with each other finally burdens the immune system and allows malignancy, in someone susceptible.