Abstract: A cigarette includes a tobacco rod, a front end plug positioned at a front end of the tobacco rod, a filter rod positioned at a rear end of the tobacco rod, and a wrapper surrounding the tobacco rod, the front end plug, and the filter rod and including at least one perforation formed in an area of the wrapper to allow air to flow to the inside of the wrapper.

Abstract: Provided is an aerosol-generating article including a wrapper which is discolored as the aerosol-generating material is heated, the aerosol-generating article including: a tobacco rod; a front-end plug arranged on a side of the tobacco rod; a filter rod arranged on the other side of the tobacco rod; and the wrapper surrounding the tobacco rod, the front-end plug, and the filter rod, wherein the wrapper includes a thermochromic material which is heated and discolored by an aerosol-generating device when the aerosol-generating article is inserted into the aerosol-generating device.

Abstract: A back bias voltage level detector is capable of accurately detecting a back bias voltage level by constantly maintaining a voltage inputted into a comparator using a clamp circuit or a current mirror circuit. The back bias voltage level detector includes voltage control circuitry for accurately detecting the back bias voltage and maintaining a constant input voltage to the comparator, and first and second resistors coupled in series between an electric voltage and a back bias voltage for distributing voltage inputted thereto. A comparator compares the distributed and inputted voltage with a reference voltage. A back bias voltage detector is provided for outputting a detection signal by determining that a predetermined back bias voltage is detected when the input voltage and the reference voltage are identical as a result of the comparison.