My research (here) has explored why the NHIS and NSDUH estimates are so divergent.

FORBES: Are Federal Taxes Driving Smokers to Stop Lighting Up?

They use the lower NHIS numbers to boast about declining smoking rates, which they attribute to higher taxes and smoking bans.

FORBES: Are Federal Taxes Driving Smokers to Stop Lighting Up?

The Office on Smoking and Health at the Centers for Disease Control and Prevention (CDC) counted 45.3 million American smokers, using the NHIS (available here).

FORBES: Are Federal Taxes Driving Smokers to Stop Lighting Up?

National statistics on smoking are provided by two federal surveys, the National Health Interview Survey (NHIS) and the National Survey on Drug Use and Health (NSDUH).

FORBES: Are Federal Taxes Driving Smokers to Stop Lighting Up?

Emphysema estimates are for adults 18 and over who have been diagnosed within their lifetime, based on national rates (NHIS) applied to county population estimates (U.S. Census).

FORBES: In Depth: Worst Cities For Ozone Pollution - 11. Hanford-Corcoran, Calif.

Chronic bronchitis estimates are for adults 18 and over who had been diagnosed in 2007, based on national rates (NHIS) applied to county population estimates (U.S. Census).

FORBES: In Depth: Worst Cities For Ozone Pollution - 12. Las Vegas-Paradise-Pahrump, Nev.

Diabetes estimates are for adults 18 and over who have been diagnosed within their lifetime, based on national rates (NHIS) applied to county population estimates (U.S. Census).

FORBES: In Depth: Worst Cities For Year-Round Particle Pollution - 18. Indianapolis-Anderson-Columbus, Ind.

Pediatric asthma estimates are for those under 18 years of age and represent the estimated number of people who had asthma in 2007 based on national rates (NHIS) applied to county population estimates (U.S. Census).

FORBES: In Depth: Worst Cities For Short-Term Particle Pollution - 20. Philadelphia-Camden-Vineland, Pa.-N.J.-Del.-Md.

Van Jaarsveld raced to fifty from 78 balls, taking consecutive fours through the covers off Gough, but after Naved ousted Dexter, he yorked nightwatchman Martin Saggers in nhis next over and had Darren Stevens caught at short-leg.

BBC: Tykes attack set for final burst