Police are arresting one person every week for smoking on buses.
The statistic has been revealed by bus company Travel West Midlands.
The travel firm and West Midlands Police have joined forces in Operation Safer Travel to cut the amount of anti-social behaviour by passengers.
They promise to prosecute everyone who is caught smoking either tobacco or cannabis.
The initiative is aimed at making people who use the bus feel more secure.
Phil Bateman, of Travel West Midlands, admitted the problem of smoking would never be wiped out, but said the company was determined to clamp down on it.