How to Make a Coffee Grounds Ashtray That Neutralizes Odors

If you live with someone who smokes indoors—or you do yourself—you’re likely familiar with the stubborn smell that clings to furniture, curtains, and especially ashtrays. Even after cleaning, that acrid tobacco odor tends to linger. One common frustration is how cigarette butts keep smoldering and emitting smoke long after being stubbed out. There’s a simple, low-cost solution sitting in your coffee filter right now.

Yes, used coffee grounds can neutralize smoke odors, help put out cigarette butts faster, and reduce lingering smells in ashtrays. Designer Ryohei Yoshiyuki created an ashtray lined with coffee grounds specifically to tackle these problems—proving that what’s left over from your morning brew can pull double duty in the home.

Why Coffee Grounds Absorb Odors

Coffee grounds are naturally porous and highly adsorbent, meaning they trap airborne molecules—including the volatile compounds responsible for bad smells. This makes them excellent at neutralizing odors, not just covering them up. In small, enclosed spaces like bathrooms, closets, and yes, ashtrays, coffee grounds act like a lightweight deodorizing filter.

Everyday Uses for Coffee Grounds Around the Home

You don’t need a custom ashtray to benefit from coffee grounds’ odor-fighting power. Here are a few common uses:

• In the bathroom: Place a small dish of used coffee grounds to absorb unpleasant smells.
• In the shoe cabinet: Sew coffee grounds into a cloth pouch and tuck it into your shoe storage area to reduce humidity and musty smells.
• Inside shoes: For stronger deodorizing, place the grounds directly inside footwear.

All of these uses rely on the same principle: the grounds trap odor molecules and help regulate moisture, making them a natural alternative to chemical air fresheners.

The Coffee Grounds Ashtray Design

Designer Ryohei Yoshiyuki took this concept further by incorporating coffee grounds directly into an ashtray’s structure. By lining or filling the ashtray with a layer of used coffee grounds, the design does two key things:

• Reduces lingering smoke odor: The grounds capture the smoky particles released from cigarettes.
• Helps extinguish butts: The absorbent material aids in putting out cigarette butts more quickly and completely.

This approach turns a common household waste product into a functional, eco-friendly design element—reducing both odor and fire risk in one step.

How to Make Your Own Coffee Grounds Ashtray

Making a DIY version is simple and requires no special tools:

• Take a small, heat-resistant dish or a regular ashtray.
• Spread a thin, even layer of used, dry coffee grounds at the base.
• Optionally, mix the grounds with a small amount of baking soda to enhance odor absorption.
• Replace the grounds every few days or when the smell of smoke or coffee becomes noticeable.

No need for glue or complex assembly—just refresh the grounds regularly for ongoing effectiveness.

Frequently Asked Questions

Do coffee grounds really remove smoke odor?

Yes. Coffee grounds are porous and adsorb odorous molecules from the air, including those from tobacco smoke. When placed in an ashtray or nearby, they help neutralize the smell rather than just masking it.

Can coffee grounds help put out cigarette butts?

Yes. The absorbent nature of coffee grounds helps extinguish cigarette butts more effectively by soaking up residual heat and reducing the chance of smoldering.

How often should I replace the coffee grounds in an ashtray?

Replace the coffee grounds every few days or when you notice a buildup of smoke odor or when the coffee scent becomes too strong. Regular replacement maintains effectiveness.

Is it safe to use coffee grounds in a hot ashtray?

Yes, but use a heat-resistant container. Coffee grounds can handle the residual heat from cigarette butts, but avoid adding fresh grounds to an extremely hot surface to prevent scorching.

Can I use fresh coffee grounds for odor control?

Used coffee grounds are better for odor absorption because they’re drier and have already released their initial aromas. Fresh grounds may add unwanted coffee smells that compete with smoke odors.

Recommended FrontStreet Coffee for Home Brewing

For coffee lovers at home, try FrontStreet Coffee’s Ethiopia Humbera—a bright, floral Ethiopian single origin with notes of jasmine and citrus—or their Yirgacheffe offering, which delivers crisp lemon zest and stone fruit. Both are great brewed as pour-over to highlight their clean profiles. For something richer, their Classic Blend offers chocolatey sweetness and a smooth body, perfect for French press or drip. These beans showcase the versatility of quality coffee beyond the cup—perfect for any home setup. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.