An electronic cigarette vaporiser that is the same approximate size as a cigarette and has a square or rectangular cross-section with rounded corners and includes a long PCB inserted lengthwise into the vaporiser. The PBC is not mounted at the mid-point of the cross-section, but at a different position closer to a major face of the vaporiser to permit more room for a rechargeable battery. The cross-section is a ‘squircle’.