A wickless hand-held vaporizer apparatus (100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300), the apparatus comprising: an elongate body; a removable cartridge (102, 1330) comprising a reservoir (108, 208, 308, 408, 508, 608, 708) configured to contain a vaporizable fluid; an atomizer (104, 1204, 1335) within the elongate body, wherein the atomizer is configured to heat the vaporizable fluid to generate an aerosol, the atomizer (104, 1204, 1335) comprising: a heating element (120, 220, 320, 420, 520, 620, 720, 820, 920, 1020, 1220); and an inner elongate tube (129, 229, 329, 429, 529, 629, 729) extending between the reservoir and the heating element, the inner elongate tube configured to permit a bulk flow of the vaporizable fluid from the reservoir to the heating element; a flow modulator (128, 228, 328, 428, 528, 628, 728, 1307) configured to modulate flow of the vaporizable fluid through the inner elongate tube from the reservoir to the heating element, wherein the flow modulator is disposed between the reservoir and the heating element, a mouthpiece (110, 864); a flow path comprising a fluid flow path from the reservoir to the atomizer and a vapor flow path to deliver vapor from the atomizer to the mouthpiece (110, 864); a draw sensor configured to detect a user drawing on the mouthpiece; a controller configured to control the flow modulator to allow bulk flow of vaporizable fluid when the user is drawing on the mouthpiece; and a battery unit, wherein the reservoir (108, 208, 308, 408, 508, 608, 708) is configured to removably couple with the inner elongate tube (129, 229, 329, 429, 529, 629, 729) of the atomizer (104, 1204, 1335), and the battery unit comprises the draw sensor, and wherein a primary means of vaporizable fluid transportation through the inner elongate tube is not via capillary action. an elongate body; a removable cartridge (102, 1330) comprising a reservoir (108, 208, 308, 408, 508, 608, 708) configured to contain a vaporizable fluid; an atomizer (104, 1204, 1335) within the elongate body, wherein the atomizer is configured to heat the vaporizable fluid to generate an aerosol, the atomizer (104, 1204, 1335) comprising: a heating element (120, 220, 320, 420, 520, 620, 720, 820, 920, 1020, 1220); and an inner elongate tube (129, 229, 329, 429, 529, 629, 729) extending between the reservoir and the heating element, the inner elongate tube configured to permit a bulk flow of the vaporizable fluid from the reservoir to the heating element; a heating element (120, 220, 320, 420, 520, 620, 720, 820, 920, 1020, 1220); and an inner elongate tube (129, 229, 329, 429, 529, 629, 729) extending between the reservoir and the heating element, the inner elongate tube configured to permit a bulk flow of the vaporizable fluid from the reservoir to the heating element; a flow modulator (128, 228, 328, 428, 528, 628, 728, 1307) configured to modulate flow of the vaporizable fluid through the inner elongate tube from the reservoir to the heating element, wherein the flow modulator is disposed between the reservoir and the heating element, a mouthpiece (110, 864); a flow path comprising a fluid flow path from the reservoir to the atomizer and a vapor flow path to deliver vapor from the atomizer to the mouthpiece (110, 864); a draw sensor configured to detect a user drawing on the mouthpiece; a controller configured to control the flow modulator to allow bulk flow of vaporizable fluid when the user is drawing on the mouthpiece; and a battery unit, wherein the reservoir (108, 208, 308, 408, 508, 608, 708) is configured to removably couple with the inner elongate tube (129, 229, 329, 429, 529, 629, 729) of the atomizer (104, 1204, 1335), and the battery unit comprises the draw sensor, and wherein a primary means of vaporizable fluid transportation through the inner elongate tube is not via capillary action.