A device (1) comprising at least: - a first flow channel (5) for inhalation； - a body part (2) comprising an inner volume (3, 4), wherein a first space (3) of the inner volume is adapted to be filled with liquid, - a second space (4) of the inner volume being arranged for receiving steam formed in the first space (3) of the interior volume, whereby the first flow channel (5) is arranged in a fluid connection with the second space (4) of the interior volume； - means (6) for carrying a gas fluid from the second space (4) of the inner volume through the first flow channel (5) to the outside of the device (1) during inhalation； and - a nozzle (10) to provide the gas flow from the first flow channel (5) to a user of the device during inhalation and to receive the gas flow exhaled by the user； characterized in that the device (1) also comprises: - a second flow channel (7) arranged in a fluid connection with the first space (3) of the inner volume adapted to provide exhaled air within the liquid； - means (8) for bringing the exhaled gas flow from the outside of the device (1) through the second flow channel (7) to the first space of the inner volume to increase the pressure in the inner volume (3, 4)； and - valves (13, 19) to prevent the pressure from increasing too much inside the device (1) during exhalation and to introduce renewal air into the second space (4) during inhalation； wherein the means (6) for carrying the gas flow from the second space (4) through the first flow channel (5) to the outside of the device (1) comprise a first valve (6) to prevent air from flowing through the first flow channel (5) within the second space (4) during exhalation and allow air to flow through the first flow channel (5) from the second space (4) during inhalation； and the means (8) for bringing the gas flow from outside the device (1) through the second flow channel (7) to the first space (3) comprise a second valve (8) to prevent air from flowing into through the second flow chan
