It is very important that the guitar avoid abusive handling and extreme environments. By this we mean that the greatest threat to the instrument’s integrity, besides being dropped or stepped on, is exposure to very high or, worse, very low humidity environments. About 50% relative humidity is ideal, and 40 to 60%, is easily tolerated. Extreme low humidity, below 40%, presents the most serious threat to this or any instrument. The wood of the guitar will shrink as it dries out and eventually crack if allowed to remain in very dry places; the desert, heated homes in winter, next to a heater, etc.
Attention, and common sense should rule here, and fortunately, there is a simple test to determine the comfort level of your guitar. Simply sight across the top or back of the instrument to examine its contour. Ideally, the surface of either the top or back will appear slightly domed or convex, the centre being a bit higher than the edge. If it is not convex, if it is flat or, worse, concave, your guitar is drying out and needs water. Put your instrument in its case along with the guitar humidifier to replenish the lost moisture, and check regularly to insure it is happy in its home.