@Ondrejke 

Yes request too,  a smoke and carbon monoxide sensor will be a good add to your home products.

  @Ondrejke you can pay attention to the smart sensor page(https://www.tp-link.com/en/smart-home/smart-sensor/) on their official website to see if a new sensor product is available, and I think the tapo app can't add other brands' products.

  @Ondrejke 

That would definitely be a much appreciated add to the Tapo sensors list.

Very helpful and could save someone's life or prevent bigger damages if a fire starts.

Please consider to add tha product 

  @Ondrejke It's possible to use basically any smoke sensor and connect it with T110, but you need SMD soldering skills and basic electronics knowledge to do that.