@Bryan ******
, Technically you can, and no written rule on how many times you can do back-to-back tourist entries. The decision for your entry is at the discretion of the immigration officer whom you'd deal with at passport control. If she has doubts about you being a genuine tourist and thinks you are 'living' in Thailand, you would be questioned and might be denied entry. Some got questioned on the 2nd entry, and some got on his 10th.