From my Big Book
The Smokeys are 4 x 6 and have player photos on front and various safety tips on back.. Looks like they are unnumbered..
The Lennox are 3 1/2 x 5 and issued in conjunction with HSE Cable Network and LEnnox Heating and Air Conditiong as indicated on front and back.. The front have full color portraits while the back features brief information about the player.. These also look unnumbered
I wouldn't say impossible.. But they are not often listed because it doesn't look like anything special to some lesser informed collectors.. They are proabbly sitting in someone's "I can't sell these" box