An electronic cigarette, cigar or pipe has a capacitor sensor includings a first conductive plate and a second conductive plate configured to form a capacitor circuit. An output of the capacitor sensor is based at least in part on the capacitance of the capacitor circuit. A pressure sensitive component is connected to the first conductive plate and configured to move the first conductive plate based on a pressure differential between two sides of the pressure sensitive component to change a capacitance of the capacitor circuit.