You would create a virtual smoke sensor which is also a switch to act as a proxy in ST. Then use Ifttt to turn that switch on. It’s hacky, but will work for some people.
@TAustin ’s VEdge Edge Driver has a virtual smoke sensor option.
Here is an Edge driver that will enable end-users to create virtual devices that run locally on-hub. UPDATED JULY 2023… Features: Supports the following virtual device types: A/C, air quality, alarm, Alexa switch, battery, CO2 level, contact, door, energy, fan, garage door, illuminance, Level/dimmer-only, lock, light (including RGBW), momentary button/doorbell, motion, panic, presence, refrigerator, smoke detector, sound pressure, sound sensor, switch, switch level/dimmer, temp/humidity, TV, thermostat, video camera, water sensor, window shade Create any number of virtual devices Easy and fast to use: No coding or CLI required Enables you to create 100% local automations with virtual devices See how many devices you’ve created of a given type (inventory) Devices include additional …