Overall, they include drugs that have long been abused, such as marijuana and cocaine, and drugs whose abuse is a more recent development. Some are stimulants, some depressants, and some hallucinogens-while most exhibit multiple pharmacological properties.
Studies of PCBs in humans have found increased rates of melanomas, liver cancer, gall bladder cancer, biliary tract cancer, gastrointestinal tract cancer, and brain cancer, [1] and may be linked to breast cancer. PCBs are known to cause a variety of types of cancer in rats, mice, and other study animals. [2].
PCB. Stands for Printed Circuit Board.. A PCB is a thin board made of fiberglass, composite epoxy, or other laminate material.Conductive pathways are etched or printed onto board, connecting different components on the PCB, such as transistors, resistors, and integrated circuits.PCBs are used in both desktop and laptop computers.onductive pathways are etched or printed onto board, connecting different components on the PCB, such as transistors, resistors, and integrated circuits. PCBs are used in both desktop and laptop computers.