Q: Will all tobaccos improve with age?
A: Generally, any tobacco with plenty of natural sugars will age wonderfully. Virginia is always a prime candidate, but so are blends with lots or Oriental leaf. Though Oriental varieties don't have as much sugar as Virginias, they do contain enough to go through fermentation in the tin, and will improve over time.
Q: How soon is blend "right" for proper smoking?
A: This is dependent upon several factors, including storage method, tobacco processing methods and personal taste. While certainly not at its best, a well conceived blend should smoke well very shortly after it's blended. If it's not good when it's young, it will never become great. Waiting a couple months, or even more, will allow the various components of the blend to "marry," to come together into a cohesive whole, rather than present themselves more as individual aspects of the blend. Within one to five years, the tobacco will really begin to shine. Beyond this time frame, the changes are much more gradual. While the blend may continue to improve for years, even decades, the changes will not be as dramatic as they are in the first few years. Some people enjoy the exuberance of young blends, while others prefer the mature complexity of tobaccos that have been aged for long periods. I recommend experimenting to see what suits you best!
Q: How long can I expect a blend to improve?
A: It really depends on the blend. A full Virginia will continue to improve, though at an increasingly slow rate, over many decades. Most English style tobaccos can go 20-30 years before they begin to go "over the hill." Balkan styles have a shorter life expectancy. Of course, storage conditions will play a part. It the tobacco is cellared at a constant, cool temperature, it will last longer than if it's stored in higher temperatures, or with lots of temperature variations.
Q: What's the best way to store tobacco for aging?
A: Ideally, tobacco should be left in its original sealed tin, and stored in a cool, dry place. It's important to realize that storage in plastic bags and the like, while allowing the tobacco to "meld," will prevent the true aging process. Plastic bags are permeable to small molecules. (Water, while not a very large molecule, is polarized, and has a hard time penetrating the barrier formed by the plastic.) If you can smell the contents through the bag, you're losing flavor and aroma! Mason jars, bail-top jars and so on are good candidates for long term storage, as long as you can resist the urge to open them to "check up" on what's happening. Aging tobacco must be left alone, with no gas exchange allowed. Once an aged tin is open, the contents should either be smoked relatively quickly, or transferred to a jar with a good seal.