The invention relates to a smoke detector and a method of smoke detection. According to the invention it is provided that a light transmitter (2) an intensity-modulated with a fixed clock frequency light signal (6) is sent which is arranged on a at a distance to the light transmitter (2) reflector (5), that a reflection signal (7) from the reflector (5) to a at a distance to the reflector (5) arranged light receiver (3) is reflected, and that the reflection signal (7) is detected on the basis of its clock frequency by means of an electronic evaluation unit (4) and a change in the intensity of the reflection signal (7) relative to the intensity of the light signal (6) is measured.