A:Answer Smart Things uses both Zigbee and Zwave, depending on the device you have connected. I wouldn't worry about anything interfering with Zwave, as that's 900mhz. Zigbee is 2.4ghz, which is the same band that 2.4Ghz wifi operates on. These cameras operate on WiFi, but I have a ridiculous amount of both Zigbee and Zwave devices throughout my house (connected via a Lowes Iris hub), in addition to a ridiculous number of devices running on 2.4Ghz WiFi (including 6 of these cameras). I haven't run into any interference issues, the response on my hub is just fine and same with the cameras.
The cameras maintain a low-power WiFi connection unless they detect motion, then they fire up the high-power "normal" WiFi. It's only then that they have any potential to cause interference really, and I'm not encountering any with 6 cameras.
Full disclosure: I am a Swann employee, thus by default I have a large amount of Swann wifi products all over my house.
Worst-case scenario: These cameras also support 5ghz WiFi. Hardly anything is on that band, so you're highly unlikely to interfere with anything.