I remember the moment I realized something was wrong with my son. It wasn’t one big thing—it was a hundred tiny things that, individually, I could explain away. Together, they told a story I didn’t want to read.
If you’re a parent in Boulder watching your teenager change in ways that worry you, you’re not imagining it. And you’re not alone. I want to walk through what the warning signs of teen drug use in Colorado actually look like—not the after-school special version, but the real, messy, everyday signs that something has shifted.
The Behavioral Shifts You Might Notice First
Teens are supposed to change. They’re supposed to pull away, test boundaries, sleep strange hours. So how do you tell the difference between normal adolescence and something more serious?
Experts say to look for patterns, not isolated incidents. One bad grade isn’t a crisis. A semester of slipping performance might be. A moody afternoon is normal. Weeks of irritability, secrecy, and withdrawal from family life? That’s a pattern worth paying attention to.
Some of the behavioral signs that show up in research include sudden drops in school performance, losing interest in hobbies they used to love, and a new crowd of friends they don’t want you to meet. You might notice them lying about small things, stealing money, or becoming unusually secretive about their room and their whereabouts.
The mood changes can be confusing too. One day they’re depressed and withdrawn. The next they’re aggressive or paranoid. It feels like living with a stranger.
The Physical Clues That Are Easy to Miss
The body tells its own story, and sometimes it whispers before it shouts.
Bloodshot or watery eyes are one of the most common physical signs. So are changes in pupil size—either unusually dilated or pinpoint small. You might notice frequent nosebleeds or a constantly runny nose, which can be a sign of snorted substances. Sores around the mouth or lips, sudden weight loss, or a decline in personal hygiene can all be red flags.
One sign that often gets overlooked is a preference for long sleeves, even in warm weather. That can be a way to hide injection marks or track marks on the arms.
Tremors, cold and clammy hands, or unexplained headaches and agitation round out the physical picture.
Why Boulder Parents Should Be Especially Aware
Colorado has some specific challenges when it comes to teen substance use. Data shows that hallucinogen use among Colorado adolescents is higher than the national average. And the fentanyl crisis has reached our schools. One 16-year-old girl from Central Colorado described it bluntly in a recent survey: “The blue pills that are fentanyl are all over my school. I know of 2 kids my age that have overdosed on them”.
That same survey found that while 84% of teens said they would try to stop a friend from taking a pill that might be laced with fentanyl, only 33% had thought about carrying naloxone. That gap between awareness and action worries me deeply.
Another survey respondent, a 16-year-old from Denver/Boulder, captured something else I’ve heard from parents: “Finding constructive ways to have fun and socialize without relying on substances is a significant challenge. It often feels like drugs and alcohol are the only options for having a good time”.
What to Do When You See the Signs
Here’s what I wish someone had told me earlier: don’t wait for a crisis to start the conversation.
Boulder County has resources designed specifically for this. The Alcohol Diversion Program is a four-week early intervention program that works with teens and their parents together. It addresses family communication, decision-making, and how to recognize risky behavior. One former participant said, “It was ten times better than I thought it would be. It was very easygoing and mellow”.
The key is not to approach your child with accusations. That shuts down the conversation before it starts. Instead, lead with concern. Lead with love. Lead with the specific things you’ve noticed, not a list of charges.
And if you’re not sure whether what you’re seeing is really drug use or just normal teen behavior, reach out anyway. It’s better to ask the question than to wait until the answer is undeniable.
You don’t have to have all the answers. You just have to be willing to look for the signs—and to act when you see them.
Wesley Cullen Davidson
Wesley Cullen Davidson is an award-winning freelance writer and journalist specializing in parenting. Currently, she is targeting her writing about recovery to parents whose children have substance abuse disorders.