An occassional bottle of wine has a particular off smell that is called "corked". It has been shown to be due to a fungus that pops up now and then in the cork. Maybe one in a hundred bottles. Once you learn the smell, it is very easy to recognize. I wonder if cork finished whiskey bottles ever have this same problem. I'd guess that it should occur. I have not run across any myself.
I have had a different kind of "corked" whiskey. My friends gave me a bottle of Chivas Regal when I got into graduate school in California (now the state of Arnold). I have had a sip of this stuff now and then over the last 27 years. After a lapse of many years, the last sip was remarkable for the VERY intense smell of the plastic liner of the screw cap. (And, no, it isn't just because it is scotch that it smelled this way.) Granted, it was 27 years old. Has anyone here noticed off smells from the caps?