In a large pot of heavily salted water, cook the macaroni according to package directions for al dente. Drain and add to a large bowl along with 2 tablespoons of the mayonnaise, and the celery and green onions. Toss well.
In a medium bowl, combine the remaining mayonnaise and the cider vinegar, mustard, bourbon, honey, salt, pepper and liquid smoke. Stir until smooth, then add to the macaroni. Taste and adjust the seasoning as needed.
Refrigerate for 1 to 3 hours to allow the flavors to meld. Garnish with green onions before serving.