Smoke taint sensing device

A plug for a container for storing liquid, the plug comprising:

• a housing;
• an input end at one end of the housing, the input end having a plurality of chambers;
• a first sensor in a first sensor chamber inside the housing, the first sensor being configured to detect guaiacol;
• a first filter near the input end of the plug, wherein the first filter selectively allows phenols including the guaiacol to enter a first input chamber of the plurality of chambers;
• a first flow pathway between the first sensor chamber and the first input chamber;
• a second sensor in a second sensor chamber inside the housing, the second sensor being configured to detect a second substance different from the phenols;
• a second filter near the input end of the plug, wherein the second filter selectively allows the second substance to enter a second input chamber of the plurality of chambers;
• and
• a second flow pathway between the second sensor chamber and the second input chamber.