In the western world, the ongoing criminal legal status of the recreational drug industry was instrumental in the formation of an anti-establishment social dynamic by some of those coming of age during the counterculture era. The explosion of marijuana use during the era, in large part by students on fast-expanding college campuses, created an attendant need for increasing numbers of people to conduct their personal affairs in secret in the procurement and use of banned substances. The classification of marijuana as a narcotic, and the attachment of severe criminal penalties for its use, drove the act of smoking marijuana, and experimentation with substances in general, deep underground. Many began to live largely clandestine lives because of their choice to use such drugs and substances, fearing retribution from their governments.