Here's what I get from some quick googling.
Decline in underage drinking, 1991-2013: https://pubs.niaaa.nih.gov/publications/surveillance101/Unde...
Youth use of cigarettes declining (though I believe I have read that vaping counter-acts this trend when looking at all nicotine products): https://www.hhs.gov/ash/oah/adolescent-development/substance...
and I was more specifically commenting towards they who are apparently the arbitrator of "cool and uncool"
Since the article is about Mexico... I have spent substantial time in Spanish speaking places. But I am unaware of current trends in Mexico, haven't been there in particular since 2006. Probably lots of smokers. Latin America tends to have more smoking than here too. I suppose they did invent the stuff.