A physician and top smoking cessation researcher says U.S. regulators and a drugmaker brushed aside his concerns a year ago about possibly dangerous side effects from longer-term use of the stop-smoking drug Chantix.

Now a new report from the nonprofit organization Institute for Safe Medicine Practices cites nearly 1,000 adverse event reports associated with Chantix. That report, released late last month, has prompted the Federal Aviation Administration to ban the drug's use among commercial pilots.

Examiners shouldn't give commercial motor vehicle license clearance to anyone currently using the anti-smoking drug Chantix, says the U.S. Federal Motor Carrier Safety Administration, which oversees the interstate trucking and bus industries.

The FMCSA announcement Thursday came a day after the Federal Aviation Administration banned the use of the drug by pilots and air traffic controllers.