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Hello, Dr Saleem here. Welcome to JA. I will be happy to share my opinion.
Well loss of taste is called Dysgeusia. Treatment involves treating the cause. In your case the likely cause is smoking . I completely understand how difficult it can be quitting that but there are now very effective ways which assist you in achieving that but only if one is WILLING.
If that isn't the case then you can benefit from few of these measure.
Adding Zinc supplements to your diet.
Using a good mouth wash swish it all around and do that at least twice a day.
Third is as advised by your dentist , brush your tongue .