Smoked "Texas" sausages run the gamut of German sausages ... wieners, hot links, wursts, kielbasas, etc. The can be made from beef, pork, beef and pork, venison, pork and venison, beef and venison, etc. They are usually smoked with hickory, mesquite or pecan although some will use some apple or other fruit woods. I had an uncle that used to make pecan smoked cheddar-venison sausage.
So - what did you have in mind when you said Texas Smoked Sausage?
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain