In a roundabout way it can. There are adapters for a breathalyzer, carbon monoxide, and I believe there is one that will detect toxic chemicals in the air. I am

In a roundabout way it can. There are adapters for a breathalyzer, carbon monoxide, and I believe there is one that will detect toxic chemicals in the air. I am by no means a scientist, but I think when it comes to "smell" in terms of sensors, it is a lot harder to do. Each "smell" detection would require a specific sensor, thus increasing the overall size, and cost, of the device if they were to all be packed in. It is easier to market/sell the sensors as adapters that can be connected to the phone.