Cedar burns with an aromatic glow, but doesn't burn for long.
In-game description

Cedar firewood is a material in The Long Dark.

It is a fuel source for a fire and increases the probability of lighting a fire by 15%.

Cedar firewood has an estimated fire duration of 1 hour. With 120 min/kg it has a better burning time per weight than fir firewood, which gives 90 min/kg.

Cedar firewood can be harvested from cedar tree limbs, using a hatchet or hacksaw. A small limb will give 3 pieces of firewood, while a large limb gives 5. Cedar firewood can also be found inside some buildings as loot.
Hides Black bearDeerMooseRabbitWolf
Other Crow featherGut
Medicinal Old man's beard lichenRose hipReishi mushroom
Sapling BirchMaple
Renewable Cedar firewoodCoalFir firewoodStick
Nonrenewable BookFirelogReclaimed wood
Renewable Birch barkCat tail headTinder plug
Nonrenewable CashNewsprintNewsprint rollStack of papers
Miscellaneous Arrow shaftArrowheadClothCured leatherScrap metal