Is smacking your dog effective in the disciplinary department?

So I smacked my dog up today because he ate the bait I lay down upon a glue mouse trap. I had previously warned him and told him no no. I also kept it in a well hidden place. I caught him the first time with the bait in his mouth and he dropped it. Then, I left him alone for less than 5 minutes. Went out to get some water and I saw the glue trap in ruins, bait gone, and glue paste on his mouth. So I held the glue up near his face and smacked him. Is this the right way? I don’t know how to use positive reinforcement for this case. What is a more milder way of disciplining? I feel horrible. But I was told this is also a way to get dogs not to poop in the home, so I figured it must be the same?