(NaturalNews) Two journal-published studies, one from China in 2004 and the other from the USA in 2007, reported that cadmium exposure effected measured reductions in bone density, osteoporosis, increased fractures in areas where cadmium pollution is high, and renal (kidney) dysfunction.
The Chinese study was epidemiological, testing subjects in a heavily cadmium-polluted area and comparing them to others in an area relatively free of cadmium pollution.  The USA study accepted bone damage findings and decided to find out what the mechanics of cadmium-poisoning with bone disease could be. 
The USA study noted that apoptosis (the normal death of a cell to allow new cell generation) was induced prematurely by cadmium, which disrupts the normal life/death cellular cycle, causing an imbalance of bone formation and leading to a cascade of signals that bring about bone disease.
Both study abstracts are displayed in Science.NaturalNews.com, a feature of the Natural News site that displays a vast array of scientific studies.
A ubiquitous source of cadmium pollution
Mentioning this brings on howls of protests and science-based opinions from deniers who refute obvious differences in contrails and chemtrails. 
But visual reports of chemtrails and trapped heavy metal measurements from the particles that drift to Earth have originated from North America, Mexico, most of Europe, the UK, Australia and New Zealand.
The most commonly reported high levels of heavy metal particulates, which can be breathed in, include aluminum, barium and cadmium. These reports also come from areas that don't have industrial pollution sources in the immediate area, but where aerosol spray geo-engineering (chemtrails) often occur.
Retired neurosurgeon and author Dr. Russell Blaylock has expressed concerns over the neurological impact of aluminum nanoparticles, which he concedes are being sprayed from high altitude aircraft. 
There are two articles in the sources below featuring trap-collected measurements of heavy metals from often aerosol-sprayed Arizona and British Columbia, Canada, after chemtrails were spotted. The Arizona collection was from an air trap, and the BC Canadian collection was from rainwater. Both samples were sent to independent labs. The results reported very high toxic levels of cadmium, aluminum, barium and others.  
The only resistance to this madness is detoxing individually and often. You can search for heavy metal detox methods on Natural News here (http://www.naturalnews.com).