It's like a scavenger hunt for cigarette butts at Muscatine High School on Wednesday.
Volunteers wear gloves as they fill plastic bags full of butts.
This is National Kick Butts Day.
These non-smokers don't plan to start.
"Younger kids, I hope it shows them not to smoke," said Logan Lilly, a student volunteer at Muscatine High. "I've had family members that have died due to smoking."
That's why youngsters are stepping up to make a stand against smoking.
They're clearing neighborhoods and learning life lessons from the litter.
"It surprises me," said Kasi Gibson, another volunteer from Muscatine High. "It really does. We're finding cigarette butts. We're finding bottles."
While Muscatine High is a tobacco-free campus, this crew is busy with butts.
Stats show that 18.1% of Iowa high school students smoke. That adds up to 30,700 teenagers.
In Illinois, the rate drops to 14.1%, but nearly 99,000 high school students smoke.
Tragically, some 55,000 young Iowans who smoke will die prematurely.
"Cigarettes tend to stay the same, but the tobacco companies are tricky," said Prevention Specialist Mandy Moody, Unity Point-Trinity in Muscatine. "They're trying to get new smokers every year."
Kick Butts Day is hosted by the Campaign for Tobacco-Free Kids.
The non-profit organization estimates that some 26 million packs of cigarettes are bought or smoked by Iowa and Illinois kids each year.
Tobacco use is the top cause of preventable death world-wide. This outdoor classroom delivers some powerful messages, one butt at a time.
"I'm against smoking completely since I was a little kid," said Lilly.
In Muscatine, it's a scavenger hunt to stamp out smoking.