I smoke, and have heard this.

I often, don't use enough salt. I purposely use less, and Im fine, no one notices. My son likes to add more salt, and I stop him when I can.

I started using less salt in my cooking on purpose, because when I was still with my kid's father, he always salted his food more, no matter what, even before tasting it, seemingly just out of habit. I would say, make eggs, and just use cracked pepper, to make it looked like I added salt (seasoned) and he never noticed.

Just kept the habit of using less.

I feel like (I know) it must be similar to sugar, where as when you use a lot, you get accustomed to it, but if you cut back you wont notice after a time. I bought chips at aldi a few months ago, and hated them, because they were too salty, I couldnt handle it.

So while I can believe that smoking makes it harder to taste food, and some folks might add too much salt to compensate, doesnt mean you habe to because you smoke.