Hi,
Not only is this possible, but it has been done by multiple people already. Here is some information from someone who did this: Homebrew BBQ Temperature Monitor/Controller VERSION 2
I am myself working on the same project (though I am not following any existing projects as I am using this as a learning project). I am going to start doing some blog posts following my progress and putting my code up in the next few days here, but I am pretty far from done.
Out of curiosity which smoker do you have?