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According to Wikipedia, it was 17.2% in the US compared with 14.9% in Australia in 2015 [1].

This was based on WHO data published in 2016.

According to the same article, the rate had dropped to under 13% in Australia in 2016. The CDC put the US 2016 rate at 15.5% [2].

[1] https://en.m.wikipedia.org/wiki/Prevalence_of_tobacco_consum...

[2] https://www.cdc.gov/tobacco/data_statistics/fact_sheets/adul...