However, this light metal is toxic in humans. Beryllium can reduce stores of magnesium and decrease organ function, possibly through interference with enzymes. Contamination with beryllium, primarily from its industrial uses, is becoming more widespread. Industrial smoke and rocket exhaust may contain higher than healthful levels of beryllium. Beryllium inhalation can cause shortness of breath, coughing, phlegm, and lujg inflammation, which can lead to chronic scarring and disability. There is some question as to whether airborne beryllium may accumulate in the lungs and create an increased risk of cancer. Though it is not very widely used, and its toxicity is fairly minor, more intense use could lead to further problems with people exposed to higher levels of beryllium dust.