Well here's my thoughts and what I've read.
First- some branch of our US government states that pine SHOULD NOT be burned in an indoor fireplace or woodstove. I think its the USDA but google the concept and you'll find it. Our government would not lie or be wrong right??
Ya sure
I got into this issue with a score of about 10 cords of free pine already bucked that just needed to be hauled to my house about 3 miles away. Been hauling it and have about 5 cords split so far. I run a small stove and plan to run one piece of pine along with 2 pieces of hard.
Further research - google- and I found a web site from some forestry school that did a study and they claim that oak will produce more creosote than pine! I love it when some nasty little fact ruins conventional wisdom. Put that in yur pipe and smoke it pal!
When I tell people I burn pine I get all kinds of weird looks and lectures about all that "pitch and sap" will cause chimney fires la de da.
The 10 or so cords I got this year were downed and bucked last year and as I split and stack it now I see no and feel no sap or pitch and except being lighter it looks and feels no different to me than the hardwoods I split and stack. Moisture on that pine is about 22-24% now. I've tried to "smell" it to see if I could learn to tell if something was pine or not and while I know the smell of pine needles I have not smelt anything from the pine I have split. Maybe the fresh green stuff "smells" - the one year old stuff doesn't.
Its been pointed out on these forums that in some parts of the US and Canada that people there burn only pine as its the only species available for such. I think those of us in the north east get spoiled as we have the largest diversity of tree species in the world here outside of a rain forest. And one would think that if pine caused chimney fires you'd see these regions where people only burn pine having lots of pretty light shows each night as peoples chimneys and houses sparkle. Have not read anything saying places like that have more chimney fires than "hardwood" regions.
Still I think the predominant theory in my area is burning pine is crazy as evidenced not just by what I quoted above but also by all the FREE pine available. After scoring my 10 cords I'm turning it down for now. I bet between CL and people I know I could easily score 100 cords of pine over the course of a summer if I could possible move and store it. Check out the NH craigslist if you don't believe me.
My theory on why people say "pine causes chimney fires" is perhaps because pine does burn hotter and if you already have a dirty and creosote filled chimney you are more likely to ignite it with a fast and hot pine fire than a slower and cooler hardwood fire.
In my never so humble and someone inexperienced opinion I think its improperly cleaned chimneys that cause chimney fires, not pine. Its like guns don't kill people..people do.
And its now May 20th and I'm still lighting one up each evening to take the chill off with some kindling and a piece of pine that gets the stove up to temp quick but doesn't make the rooms hotter than we want.
Pine is fine- just clean your damn chimney as you should with any wood burning!