each time upon contacting with user 39 s mouth the resistance sensor 119 activates the control circuit 108 the control circuit 108 then provides operating current to the thermal drive pump and the electric heater and the output of the control circuit is turned off after the delay of 2 seconds for reactivation at the next smoking action alternatively a thermal expansion drive pump or a thermal bubble pump is also applicable the thermal expansion drive pump forms a pressure cavity for pumping out liquid by allowing a micro hydrogen container with an embedded electric heating element to block the liquid inlet and open the liquid outlet at the time of thermal expansion the charging jack 102 led 103 cell 105 switch 109 liquid refilling valve 112 and air hole 116 are shown in fig7 the electrode lead wire 401 heating wire 402 thread 403 base 404 and nozzle 405 are shown in fig3 the support 501 extension spring 502 pumping out pressure plate 503 silicon gel tube 504 stop pressure plate 505 supporting spring 506 memory alloy wire 507 electrode a 508 electrode b 509 and electrode 510 are shown in fig5 example 3 the electronic cigarette made of a ni u2014 ti memory alloy fig8 is a structural diagram of.