| Air Inlet | Small opening that allows surrounding air to enter the device | When the user inhales or activates the pen, air is drawn through the inlet and directed toward the aroma section. |
| Aroma Source | Flavor material such as a scented insert, aroma-infused medium, or flavor capsule | The incoming air passes over or through the aroma source and picks up volatile scent molecules. |
| Airflow Channel | Internal passage that guides air from the inlet to the mouthpiece | The channel controls the route of the air and helps mix the surrounding air with the released aroma. |
| Activation Method | Draw-activated sensor or, in some designs, a manual button | Activation opens the airflow path or starts the device’s operating cycle. Draw-activated models respond to the user’s inhalation. |
| Heating Element | May be absent in passive designs; some products use controlled heating | A passive pen releases scent through airflow alone. A heated design warms the aroma material to increase release, but it may produce an aerosol rather than only scented air. |
| Power Source | None for passive models; a rechargeable or replaceable battery for powered models | Passive models rely on inhalation. Powered models use electricity for sensing, lighting, or heating, depending on their construction. |
| Mouthpiece | Designed to provide the final contact point for the user | It directs the flavored airflow out of the device and can help maintain a consistent draw through the internal air path. |
| Scent Release Process | Air movement carries volatile aroma compounds from the flavor material | The scent is perceived when these compounds travel with the inhaled air and reach the nose and mouth. The experience depends on airflow, aroma concentration, and the user’s sensitivity. |
| Visible Vapor | Not required for a scented-air experience | A passive flavored air pen normally produces no visible cloud. If a device heats a liquid or other material, it can generate an aerosol that is different from ordinary scented air. |
| Flavor Intensity | Usually affected by airflow speed, aroma material, temperature, and product design | A stronger draw can increase the amount of air passing through the aroma area, while a depleted or sealed aroma source may reduce the perceived flavor. |
| Consumable Life | Varies according to the amount of aroma material and frequency of use | Scent intensity generally decreases as the aroma source becomes depleted. The usable life cannot be determined reliably without the device’s design and usage conditions. |
| Primary Output | Flavored airflow or, in some powered designs, an aerosol | The output depends on whether the pen uses passive air contact or heat. These two mechanisms should not be treated as identical. |
| Key Safety Consideration | Ingredients and operating method should be clearly disclosed | Users should check the product’s ingredient information and instructions. “Flavored” does not automatically mean risk-free, and inhalation suitability depends on the specific materials and design. |