Chew it, assuming it's coniferous and no weird tree I've never heard of. I've heard about decorative firs being poisonous, though that might be the berries.
Heat it and use it to plug stuff that needs to be air/water tight if you're in a pinch.
Dry it, powder it, and use it a bit like chalk for when you need good grip. I believe they use it in japanese archery.
>>2711315I believe they used them as "firesticks" before electricity. You'd walk around with one smouldering at the tip in your mouth, and touch it to stationary lamps to light them. Then, just blow them out when you leave.