Hello. I am a great tobacco smoker and ive noticed that my tobacco goes very dry in the winter. Its cold here in norway so maybe the air is dryer in the winter? Anyway, wondering if you guys have any similar problems?
I believe a humidor is the usual solution for this problem.
From back in my long-distant days as a tobacco smoker, I recall having good results from freezing it. Not in a chest freezer, just the freezer part of a refrigerator. It retains its moistness and yet it thaws instantly once you’re hitting it with a lit match.
The short-term solution (for today) is a piece of potato or apple or something. Potato keeps things in the family (Solanaceae) and apple will impart its own flavor and aroma. Nice the first day and kinda gross thereafter. The long-term solution is a piece of unglazed terracotta. A fragment of brick from a construction site will work fine, although tobacconists usually sell a product made for this purpose that looks much better (in the shape of a leaf, for example). Look online for “hydrostone” and you’ll see what I mean (not sure if that’s a brand name). Either way, you submerge the terracotta in water for a few minutes, dry it off and keep it buried in your loose tobacco or in contact with your rolled cigarettes. I roll my own and keep the loose tobacco in a Tupperware container with the terracotta year-round. You can easily make your tobacco too moist, in which case it won’t burn well, so don’t overdo it.
You mean a potato into the tobacco, or close to the tobacco?
Bury it in the tobacco if it’s loose (for rolling your own or smoking in a pipe). If you’re talking about pre-made cigarettes, keep in contact with them (but the terracotta or other solution will be better).
Don’t smoke the potato! 
ETA: I saw an old guy moisten the tip of a pre-made cigarette before lighting it. He said his cigarettes were stale, and he did it because, with that first puff, the water tuned to steam and moistened the rest of the cigarette.
The tips I’ve heard are potato or apple (or orange) peels, not the whole spud or fruit. That’s not as messy because the peels not really rot, but only dry out and transfer their moisture to the tobacco in the process.
Most of the first Google hits I’ve (just) seen talk about whole pieces, but the peels do sound better.
I’ve also just seen a reference to using a small piece of sponge.
Gotta insist, though, that terracotta beats 'em all.
Why is dryness a problem?
Surely when you burn it to release the nicotine and carcinogens in the smoke, you will want it to be dry so as to burn completely, right? It would seem that having it moist would defeat the purpose.
It burns up too fast. You only want it to burn when you draw off the cigar or pipe.
<deleted, because everyone else already said it>
And harsh!
Take a tip from cannabis smokers and get some Boveda humidity control packs. . They’re cheap and they work. Then again, so do orange peels.
Thanks for all the answers guys! Lots of interesting reading for me. I tried the apple piece in my tobacco today, so ill see later if it worked on my pretty dry tobacco i have atm.
I have to add though, i dont smoke cannabis, sigars or pipe. I buy packets of tobacco and rolling paper to roll my own smokes. I dont like filter cigarettes, i much prefer the feeling of my own rolled tobacco. Ive used that for about 35 years now, so thats what i prefer.
Now someone asked if it matters if the tobacco is dry. Yes it does when you are rolling smokes. The dry tobacco falls apart as it dries, and gets more and more fragmented, until its very very difficult to roll them into the tobacco paper. So the dryness really is a problem in my case - and the dry tobacco dont taste as good to smoke as fresh tobacco.
Just for clarifying my situation 
UPDATE! It seems the apple suggestion worked quite surprisingly well. My dry tobacco is now slightly moist, but not too moist. I wonder if i taste the apple scent though
Second UPDATE!
It seems my tobacco got all wet after a while together with the apple. Ill look into the orange peel solution!
Slightly moist tobacco wouldnt be a problem if i smoked a pipe, but with the rolling paper, it makes it unfit.
Told ya 
Yes, you will. I used to use apples in my cigarette rolling tobacco, and there was a definite apple flavour in the tobacco–enough that it caused a hitch in my throat.
Nowadays, even though I only smoke pipes now, I find my pipe tobacco does well with a piece of potato, or a chunk of carrot, if it’s getting dry. Both are pretty neutral, and don’t affect the flavour of the blend.
Trying potato now, apple made the tobacco a bit sweet in taste
UPDATE! Potato worked magnificiently! My old tobacco leftovers became like new, although they were a bit fragmented already, they taste and roll like real tobacco.
Thanks potato guy!