Drug use, legal or otherwise, does tend to increase under economic/social pressure. Drug use in the 60's, and especially in the 70's, can be linked to the various Cold War concerns and economic crises.
What we really need is honest education regarding drugs. School kids are taught all sorts of absurd things about drugs in school. We need honesty, not politically motivated education.
Drugs will be less and less glamorous to young people, and to all people, when honest information is disseminated, and when governments refrain from situations which cause their population's anxiety.