23-03-13, 10:49 AM
Like Ken said, it's the "foamy" soles you've got to be careful with. Superstars should be fine either way apart for some stripe/heal/tongue materials that may crack over time. I have 4 pairs of Pro Mods from 93/94 and the only pair that had no signs of deterioration was the one that had been worn over the years. If it's a matter of the shoe getting to breathe, moisture, dryness or flexing the sole/upper I don't really know (probably the last one or a combination). I have other DS pairs too from the same year and line with different signs of deterioration. One has clearly been exposed to excessive smoking 
Almost every used pair I've got from the UK smell of cigarette smoke though
Almost every used pair I've got from the UK smell of cigarette smoke though