4 principles of psychoactive drugs (compounds that alter consciousness and affect mood: drugs are not good or bad. When drug abuse, dependence and risky drug use are talked about, it is the behavior/the way the drug is being used, that is being referred to. A drug sitting in it"s bottle etc. has no evil intent. Blaming the substance will make us forget about drug-related problems: every drug has multiple effects. They also influence blood pressure, intestinal activity and other functions: both the size and quality of a drug"s effect depend on the amount an individual has taken. There is no compound that alters only one aspect of consciousness. All psychoactive drugs act on more than one place in the brain. They also influence blood pressure, intestinal activity and other functions. Extent of drug use: measured widely across junior high, high school and university because it has minimal fuss.