The other morning during my usual 6:30 walk with Lottie, something small happened that stayed with me all day. A jogger passed us going the opposite direction, and I smiled and nodded. She smiled back, just briefly, and kept running. That was it. Nothing dramatic.

But here’s the thing: I felt better afterward. Lighter somehow. And it got me thinking about this simple habit I’ve had for years, one that didn’t develop from any self-help book or conscious effort. I just smile at people I pass.

Turns out, according to psychology research, this small gesture says quite a bit about how we navigate the world. People who naturally smile at strangers exhibit behaviors that go far beyond basic politeness.

Let me share what the research reveals about this.

1) Higher levels of empathy

One of the first things that jumped out at me from the research is the connection between smiling at strangers and empathy.

During my years in middle management at the insurance company, I worked with hundreds of people. Some could read a room instantly, sensing when someone was struggling even when they hadn’t said a word. Others seemed oblivious to the emotional temperature around them.

The ones who smiled at strangers, acknowledged janitors in the hallway, made eye contact with people they didn’t know? Those were almost always the same people who showed genuine concern when a colleague was going through a rough patch.

Research on empathy shows that the ability to perceive and be sensitive to the emotional states of others is coupled with a motivation to care for their well-being. When you smile at a stranger, you’re acknowledging their humanity. You’re signaling, even unconsciously, that you recognize them as a person worth noticing.

This isn’t about being a saint. It’s about having that basic capacity to register another human being’s presence and respond to it. People who smile at strangers tend to have this sensitivity dialed up just a bit higher than average.

2) Greater social confidence

I’ll admit something: when I was younger, I rarely smiled at strangers. I was too worried about how I’d be perceived, whether they’d think I was weird, whether they’d ignore me.

It took years, honestly until my 40s, before I became comfortable with that small act of acknowledgment. And you know what changed? My confidence in social situations overall.

People who naturally smile at strangers tend to have a certain ease in public spaces. They’re not constantly monitoring for threat or rejection. They’ve learned, through experience probably, that most people respond neutrally or positively to a smile.

This confidence isn’t arrogance. It’s more like a quiet comfort with being seen and seeing others. During my Thursday chess games with Bob, I’ve noticed he’s the same way. He’ll strike up a conversation with anyone at the community center. That ease didn’t come from nowhere, it’s built on thousands of small interactions where nothing bad happened.

3) Prosocial tendencies

Here’s something fascinating: people who smile at strangers are more likely to engage in other forms of prosocial behavior.

When I volunteer at the literacy center teaching adults to read, I see this constantly. The volunteers who greet everyone warmly, strangers and regulars alike, are the same ones who stay late to help, who bring in extra materials from home, who check in on students who’ve missed sessions.

The connection isn’t coincidental. Studies have documented that empathy significantly predicts prosocial behavior, and that individuals with strong social support systems are more likely to help others.

Smiling at strangers is a micro-version of this larger pattern. It’s a small act of social generosity. You’re giving someone a moment of pleasant recognition without expecting anything in return.

Over time, these small gestures add up. They shape who you are and how you move through the world. People who practice this consistently tend to be the ones who also hold doors, offer directions to lost tourists, and help carry groceries for elderly neighbors.

4) Lower baseline anxiety in social settings

One thing I’ve learned from watching my grandchildren navigate the world is that social anxiety isn’t unusual. My oldest grandson, who’s 14 now, goes through phases where he barely makes eye contact with adults outside the family.

People who comfortably smile at strangers generally have lower levels of social anxiety. They’re not constantly worried about being judged or rejected by people they encounter.

This doesn’t mean they’re extroverts who love crowds. Some of the most socially anxious people I’ve known were quite outgoing once they felt safe. The difference is in that initial moment of contact with an unknown person.

Research shows that over time, positive micro-interactions such as smiling at strangers can reinforce a sense of safety around others, teaching the nervous system that connection doesn’t always come with risk.

It’s like a feedback loop. Each time you smile at someone and they smile back, or even just nod neutrally, you learn that this interaction is safe. Your brain files it away. Eventually, smiling at strangers becomes automatic rather than anxiety-producing.

5) Present-moment awareness

In our Wednesday morning coffee ritual, my wife and I people-watch. It’s one of our favorite pastimes. And you can always tell who’s present and who’s lost in their own thoughts.

The people lost in their heads walk right past others without seeing them. The ones who are present make eye contact, nod, smile.

Smiling at strangers requires a basic level of awareness. You have to actually notice people, register their presence, and respond. You can’t do that if you’re completely absorbed in your internal world or your phone.

As I’ve gotten older, especially after retirement when I started writing, I’ve become more deliberate about staying present during my daily walk with Lottie. It’s easy to get lost planning your day or rehashing yesterday’s problems.

But when I make the effort to see the people I pass, to smile at them, I’m practicing presence. I’m here, in this moment, acknowledging another person who’s also here in this moment.

6) Healthy boundaries with in-group bias

Here’s an uncomfortable truth: humans are tribal. We naturally favor our own groups over outsiders.

But people who smile at strangers show a willingness to step outside that comfortable in-group bubble, even briefly. They’re extending a small gesture of friendliness to someone they don’t know and may never see again.

I learned about my own in-group biases when my daughter married outside our race. It confronted prejudices I didn’t even know I carried. The experience taught me that expanding your circle, even in tiny ways, challenges those automatic tribal instincts.

Research documents that our empathic responses are heavily modulated by whether someone is in our social group or not. But people who consistently smile at strangers are practicing a small form of resistance against that bias. They’re treating unknown people as worthy of acknowledgment.

It doesn’t solve tribalism, obviously. But it’s a start.

7) Optimistic outlook on human nature

During my 35 years at the insurance company, I watched colleagues develop two very different worldviews. Some became increasingly cynical, seeing every customer as potentially difficult, every claim as probably fraudulent.

Others maintained a basically positive view of people, even after dealing with thousands of interactions, many unpleasant.

Guess which group smiled more at strangers?

People who smile at passing strangers tend to have a fundamental optimism about human interaction. They expect positive or at least neutral responses. They don’t approach unknown people with suspicion or defensiveness.

This optimism isn’t naïve. These folks have been rejected or ignored just like everyone else. But they’ve decided, consciously or not, that the world is generally safe enough for small gestures of friendliness.

I’ve found this outlook invaluable, especially as I’ve aged. Yes, bad things happen. Yes, some people are unkind. But most interactions are fine, sometimes even lovely. Smiling at strangers reinforces that reality.

8) Emotional resilience

When I had to fire an employee who was also a friend, it was one of the hardest things I’d done professionally. The emotional toll was significant. What helped me through it was maintaining my normal routines, including my walks where I smiled at people I passed.

Those small positive interactions, meaningless on their own, created tiny deposits in my emotional bank account. They reminded me that the world contained friendly faces, brief moments of connection, simple human warmth.

People who smile at strangers tend to have developed this form of emotional resilience. They’ve learned to gather small positives from their environment. They’re not dependent on any single source of validation or connection.

When life gets hard, and it does for everyone eventually, having this skill matters. You’re better equipped to bounce back if you can still find small moments of human connection in your daily life.

9) Intrinsic motivation for social connection

Finally, people who smile at strangers are acting on an internal motivation rather than external pressure.

Nobody’s watching. There’s no reward. You gain nothing tangible from smiling at a jogger on your morning walk. Yet some people do it anyway.

This reveals something important: these individuals have an intrinsic drive toward social connection. They’re not being friendly because they were taught to be or because they want something. They’re doing it because it feels natural to acknowledge other humans.

During my weekly poker game with friends, we’ve talked about what motivates people. Some folks need external structure and rewards to function. Others are driven by internal compasses. Neither is better, they’re just different.

But smiling at strangers definitely falls in the second category. It’s internally motivated behavior that costs nothing and benefits everyone involved in small ways.

Conclusion

Looking back over these behaviors, I realize they’re all connected. Empathy, social confidence, prosocial tendencies, low social anxiety, present-moment awareness, resistance to in-group bias, optimism, resilience, and intrinsic social motivation. They form a constellation of traits that make life richer, not just for you but for everyone you encounter.

The next time you’re walking down the street, notice who makes eye contact and smiles. Notice who doesn’t. Think about which group you’re in and whether it matters to you.

For me, that simple smile at a passing stranger has become a small daily practice that keeps me connected to the world around me. And at 60-something, maintaining those connections feels more important than ever.

So here’s my question: when was the last time you smiled at a stranger? And if you don’t, what’s stopping you?