You can always go with, "They're bad for developing brains and bodies."
The earlier you start drinking, smoking, or doing drugs the easier it is to find yourself dependant on them as you won't develop healthy coping habits or find healthy ways to enjoy your spare time.
It's better than telling them nothing at all
And if your kids have grown to trust you and value your opinions then they'll listen
Better than the 80s/90s method of "drugs bad, mmmkay? They ruin your life" and then proceed to ruin the drug user's life.
Start drinking young and you'll end up more fucked up than bubbles, I mean just look at him.
I started drinking when I was 12, it started quite the struggle with addiction in my life.
I've been sober now for 4 years.
It took 4 attempts to get sober and stay with it but I'll never drink again.
That's also what a friend of mine said to every doctor in the Hospital when she overdosed on Amphetamine.
Well she didn't die. Just almost.
They told her she needs to stop taking drugs or she dies.
The meme is a joke. My reply is flippant, but true.
Either way you die. Ya want your little brief window of existence to be about just getting high, or add to it creating/doing/connecting/fucking/helping/discovering/being?