There’s a ton of people who dip or use chewing tobacco… no second hand smoke there.
Only 2.4% of US adults use smokeless tobacco: https://www.cdc.gov/tobacco/data_statistics/fact_sheets/smok...
This second link also says that 3.5% of adult smokers also use smokeless tobacco. 3.5% of 14% is 0.49%. So about 0.49% of US adults are dual users of both smoked and smokeless tobacco, leaving about 1.91% of US adults as exclusive smokeless tobacco users.