The reason you have not found anything on the FDA website is that LLT for smoking cessation is only at the IRB level, meaning each LLT center for smoking cessation must operate under an IRB, and that if you get their services for smoking cessation, your results will be sent to and tallied by the FDA as a sort of experiment (research) to one day be able to publicly state "LLT is approved as effective in smoking cessation". Everyone's results are protected for privacy, of course.

The little bit of literature I've seen done using LLT for smoking cessation states that preliminary findings show it is slightly more effective than "the patch", which may or may not be saying much as it has turn out that the Patch is not as effective in smoking cessation as originally thought it was to be.

Still, I wouldn't say no, even if it does cost $300-$400: If it does get you to quit smoking, $300-$400 will seem like nothing compared to the costs you will incurr in the future from lung cancer or COPD.

My personal suggestion is to find a LLT center which employs licensed healthcare professionals of some sort, perhaps in this case a licensed acupuncturist.
References :
http://www.a-body-for-living.com/laser-therapy-melbourne.html