Is it safe to eat marshmallows cooked over propane?

Yes, marshmallows cooked over a propane flame are safe to eat. Propane combustion produces carbon dioxide and water vapor — no toxic residue transfers to food during brief roasting exposure.

Propane burns cleanly at high temperatures, leaving no meaningful chemical deposit on food held in the flame for a few seconds to a couple of minutes. The concern most people raise is about unburned hydrocarbons, but at the short roasting distances and durations involved in toasting a marshmallow, measurable contamination does not occur. The marshmallow's sugar crust chars from radiant heat, not direct contact with combustion byproducts.

• Propane combustion byproducts: primarily carbon dioxide (CO₂) and water vapor (H₂O) — no toxic residue.
• Typical marshmallow roasting distance from flame: 2–6 inches, minimizing direct combustion gas contact.
• Propane flame temperature: approximately 3,600°F — burns fuel more completely than wood, producing less particulate.
• Wood campfire smoke contains benzene and formaldehyde; propane flames do not produce these compounds in meaningful quantities.