Teen drug and alcohol use has fallen
washingtonpost.com
washingtonpost.com
Also, I'm betting that alcohol consumption isn't down overall in teens, they're just smart and would never say they've had a drink or drink at any point. Speaking from very recent personal experience.
That is exactly what happened. Global tobacco business is better than ever:
http://theinfluence.org/neuroscientist-meth-is-virtually-ide...
Almost all toothaches do not need a root canal, but some toothaches are definitely the first warning sign for needing a root canal.
<strike>Children</strike> People, who are more likely to try cigarettes/alcohol are also more likely to try harder drugs, and people who are more likely to try harder drugs are more likely to try even harder ones. Usually the causality is related to issues at home / issues at school / issues of biology+psychology. They have a desire to exit society because it has failed them. The fact that they do "mild"(i.e. more common) drugs before they do "harder" ones is simply common sense on their part. FWIW, these same people would likely fail the cookie test[0].
There is an interesting Ted talk[1] which discusses the correlation between heroin addiction and a feeling of belonging. i.e. if you feel detached from your community you're at risk. And inversely if you're an addict, being accepted into a community is the biggest predictor of successfully overcoming the addiction.
[0] https://en.wikipedia.org/wiki/Stanford_marshmallow_experimen...
[1] https://www.ted.com/talks/johann_hari_everything_you_think_y...
https://www.drugabuse.gov/related-topics/trends-statistics/i...
https://chrome.google.com/webstore/detail/just-read/dgmanlpm...