how is cadmium, as a heavy metal, dangerous for our health?

Cadmium is an element that the human body does not require
for health. Because we don't need it and it is not common in an all-natural diet, the
body has no mechanism for controlling the level of cadmium or for clearing it from the
tissues. One consequence of this is bioaccumulation in both our bodies and those of the
animals we eat.

Cadmium has a number of industrial uses. It
is used as a pigment in paints, a plastic stabilizer, an anti-corrosion coating on other
metals, and in Nickel-Cadmium (NiCad) batteries.It is also found in varying amounts in
natural soils.

We are exposed to cadmium by eating meat
that has accumulated cadmium in it, by smoking tobacco, and by sanding, grinding, or
heating materials that cadmium has been incorporated into or coated onto. Cadmium that
is inhaled seems to have a more immediate toxic effect, causing respiratory distress and
pulmonary edema, or fluid buildup inside the lungs, a dangerous condition which can be
fatal. Cadmium that is swallowed can lead to a variety of problems including osteopenia,
which is a painful weakening of the bones, kidney failure, and
cancer.