I, too, am concerned about cancer causing carcinogens in smoked/barbecued final products. But there are no dangers of adding 1 tsp of liquid smoke to a batch of BBQ sauce. You would have to drink 3 bottles of liquid smoke a day (!) to go over the safety limit of 47. 1 tsp of liquid smoke. However, I recommend to buy liquid smoke with only 2 ingredients: water and smoke concentrate. I have seen molasses (GMO for sure) and caramel colour in some brands. (If you do want to dig deeper, here is a video from Helyn's Healthy Kitchen by Dr. Michael Greger, where he explains liquid smoke dangers in a nutshell.)