It has supposedly dropped to below 10% (but higher on average in rural areas than in cities, and of course that's just smoking, not the use of other nicotine products)

https://hsph.harvard.edu/news/u-s-smoking-rate-hits-an-all-t...

The article suggests that 18%+ are using some kind of nicotine product in general (zyn, chewing tobacco, vape, smoking)

In any case it has been mostly successfully purged from public spaces.