[kragen]

You can make a bigger fire, or heat rocks in the fire and sit in front of the rocks, or burn the wood to charcoal under a big pile of dirt before using it for your fire, or pipe water through the fire and run it through a radiator, or insulate your tent, or build big thick adobe walls with enough thermal mass to keep your temperature reasonable, or use careful passive solar design to keep your entire house at a comfortable temperature all year round.

There are options that don't involve smelling like a campfire.