India, Aug. 1 -- When we think about lung cancer, we usually think about smoking. Many people, especially women and people who do not smoke, get lung cancer even though they have never used tobacco. Now experts are looking at the air inside our homes to see if it is causing problems. They think that the air inside our homes might be making us sick.

In India, many people have started using fuels to cook, which is a good thing. There are still many homes, especially in rural and semi-urban areas, that use things like firewood, crop residue, coal or dung cakes to cook. When we burn these things, they release particles and chemicals into the air that can go deep into our lungs.

"The World Health Organisation says that bad air in our homes c...