He is required to be fit as a fiddle for his energetic roles in high-octane movies such as The Bourne Identity.
But on Saturday, Matt Damon, 47, was seen puffing on a cigarette and chugging down a beer alongside radio host Michael 'Wippa' Wipfli and friends while spending time on the Gold Coast, Queensland.
Matt looked to be having a ball while he puffed away and sipped on a Stone & Wood Pacific Ale.
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That's a bit naughty! Matt Damon, pictured, was busted puffing away on a cigarette while enjoying beers with radio host Michael 'Wippa' Wipfli in Queensland over the weekend
An unshaven Wippa, who co-hosts the Fitzy & Wippa breakfast radio show in Sydney, looked thrilled to be in the company of the A-list actor.
At one point, Matt took off his sunglasses and held up his beer as he hugged a female friend.
The Ocean's Eleven star has certainly adapted well to life in Australia, enjoying frequent trips Down Under.
Matt is close friends with Byron Bay local and fellow A-lister Chris Hemsworth, 34.
Cheers: An unshaven Michael 'Wippa'