A mist generator device for delivering nicotine, the device comprising: a mist generator housing which is elongate and comprises an air inlet port and a mist outlet port; a liquid chamber provided within the mist generator housing, the liquid chamber containing a liquid to be atomised, the liquid including nicotine; a sonication chamber provided within the mist generator housing; a generally planar capillary element comprising an enlarged end, a first portion and a third portion having a generally rectangular shape and a second portion and a fourth portion having a partly circular shape, the capillary element folded such that the first and second portions (223, 224) are superimposed on the third and fourth portions (225, 226) respectively and the ends of the first portion and the third portion define the enlarged end, the capillary element extending between the liquid chamber and the sonication chamber such that the first portion and the third portion of the capillary element are within the liquid chamber, the enlarged end sits in the liquid contained in the liquid chamber and the second portion and fourth portion of the capillary element are within the sonication chamber; an ultrasonic transducer having a generally planar atomisation surface which is provided within the sonication chamber, the ultrasonic transducer being mounted within the mist generator housing such that the plane of the atomisation surface is substantially parallel with a longitudinal length of the mist generator housing, wherein part of the second portion of the capillary element is superimposed on part of the atomisation surface, and wherein the ultrasonic transducer is configured to vibrate the atomisation surface to atomise the liquid carried by the second portion and the fourth portion of the capillary element to generate a mist comprising the atomised liquid and air within the sonication chamber; and an airflow arrangement which provides an air flow path between the air inlet port, the sonication chamber and the air outlet port such that a user drawing on the mist outlet port draws air through the inlet port, through the sonication chamber and out through the mist outlet port, with the mist generated in the sonication chamber being carried by the air out through the mist outlet port for inhalation by the user. a mist generator housing which is elongate and comprises an air inlet port and a mist outlet port; a liquid chamber provided within the mist generator housing, the liquid chamber containing a liquid to be atomised, the liquid including nicotine; a sonication chamber provided within the mist generator housing; a generally planar capillary element comprising an enlarged end, a first portion and a third portion having a generally rectangular shape and a second portion and a fourth portion having a partly circular shape, the capillary element folded such that the first and second portions (223, 224) are superimposed on the third and fourth portions (225, 226) respectively and the ends of the first portion and the third portion define the enlarged end, the capillary element extending between the liquid chamber and the sonication chamber such that the first portion and the third portion of the capillary element are within the liquid chamber, the enlarged end sits in the liquid contained in the liquid chamber and the second portion and fourth portion of the capillary element are within the sonication chamber; an ultrasonic transducer having a generally planar atomisation surface which is provided within the sonication chamber, the ultrasonic transducer being mounted within the mist generator housing such that the plane of the atomisation surface is substantially parallel with a longitudinal length of the mist generator housing, wherein part of the second portion of the capillary element is superimposed on part of the atomisation surface, and wherein the ultrasonic transducer is configured to vibrate the atomisation surface to atomise the liquid carried by the second portion and the fourth portion of the capillary element to generate a mist comprising the atomised liquid and air within the sonication chamber; and an airflow arrangement which provides an air flow path between the air inlet port, the sonication chamber and the air outlet port such that a user drawing on the mist outlet port draws air through the inlet port, through the sonication chamber and out through the mist outlet port, with the mist generated in the sonication chamber being carried by the air out through the mist outlet port for inhalation by the user.