What types of smoke alarms are available on the market?
There are two types of household smoke alarms in common use. These are known as ionization or photoelectric type smoke alarms.
How does an ionization type smoke alarm work?
This type of alarm uses a small amount of radioactive material to ionize air in the sensing chamber. As a result, the air chamber becomes conductive permitting current to flow between two charged electrodes. When smoke particles enter the chamber, the conductivity of the chamber air decreases. When this reduction in conductivity is reduced to a predetermined level, the alarm is set off. Most smoke alarms in use are of this type.
How does a photoelectric type smoke alarm work?
A photoelectric type smoke alarm consists of a light emitting diode and a light sensitive sensor in the sensing chamber. The presence of suspended smoke particles in the chamber scatters the light beam. This scattered light is detected and sets off the alarm.
Just from this info on how smoke detectors operate, It seems "particulates" cause both sensor types to activate. Although vaping doesn't produce smoke, the vapor can be considered to be made up of paticulates. If you blew the vapor DIRECTLY on the smoke detector(while it's still visible and in it's particulate form); it stands to reason the detector would react to the particulate vapor. I would imagine there would be little to no chance of a smoke detector activating with vaping, unless you directly blew the vapor at the detector or you were in a small enough enclosure to allow the vapor to reach the detector in tact .