Even if the pod fits, the coil resistance has to match your device's power output. Here's the rule of thumb:

• Low resistance (0.5–1.0 ohm) needs higher wattage (25–50W).
• High resistance (1.2–2.0 ohm) needs lower wattage (8–15W).

If you put a low-resistance pod on a low-wattage device, you'll get weak vapor and poor flavor. If you put a high-resistance pod on a high-wattage device, you'll burn the coil and get a harsh, burnt taste.

Also, check the battery. A pod that needs 40W won't work well on a device that maxes out at 15W. The battery simply can't deliver enough power.