Country Legend Merle Haggard Back in the Hospital with Pneumonia
03/02/2016 AT 01:55 AM EST
Merle is recovering in a hospital in California and has been forced to postpone his March concert tour dates, his rep tells the Associated Press in a statement.
According to the statement, the 78-year-old musician also canceled dates last month as he was still suffering from his last bout of pneumonia in both lungs.
Haggard has been told by doctors to rest and recover for at least one more month without performing.
In 2009, Haggard told PEOPLE how he was doing "better every day" after undergoing lung cancer surgery.
The singer was a heavy cigarette smoker until he gave up his Camels in 1992, but insists his cancer wasn't caused by smoking.