After 5 years ex smoker do I still need annual low dose ct scan of the lungs.

I would think not. But this is a function of the amount of radiation you are getting which is lifetime dosing. If you total up all early doses that were from treatment (high) and lifetime low dosing from dental X-rays and solar etc (low) you have to decide if this method of early discovery of a lung cancer is still a good idea since its lifetime dosing of something very capable of starting its own cancers. All the low dosing which you don’t give a gy value for may be inconsequential when compared to your treatment finding. I don’t think with out those gy numbers, there is any answer to your question that is scientifically sound. I’m not knowledgeable of best practices in lung cancer detection from smoking so this is pretty much in my opinion a non answer, but an opinion.

I received 2gy a day total 60 gy in 30 days