The present invention relates to a cap that is configured to releasably cover an inlet of a vaporization assembly for a portable electronic vaporizing device. The cap comprises a first inner cap portion, a second outer cap portion, a channel formed in between the first inner cap portion and second outer cap portion, a cap inlet, and a cap outlet. The cap is configured to flow gas therethrough from the cap inlet to the cap outlet via the channel, to introduce gas into the vaporization assembly, when the cap is positioned to cover the inlet of the vaporization assembly.