Morphine is a painkiller medication of the opiate type which is found naturally in a number of plants and animals. It can be taken for both acute and chronic pain. Barbiturates is often mistaken for truth serum as the drug does not itself face people to tell the truth, but is thought to decrease inhibition and slow creative thinking, making subjects more likely to be caught off guard when questioned and increasing the possibility of the subject revealing information through emotional outburst. Smoking or chewing tobacco immediately raise the blood pressure temporarily but the chemicals in tobacco can damage the lining of your artery wall. Cocaine is given to patients after surgery, as it acts as a local anaesthetic by blocking conduction of nerve impulse.