I dont' think it will cause any harm, remember the old iron wok we used to use back in China?
Costco used to sell a non-stick pan for 29.95, it was 12 inches in diameter, very good.
A better one would be the hard anodized wok like All-Clad, Circulon, Analon, and Calphalon, but these are very expensive, worth the money, but expensive.
I'd also recommende T-Fal, Fabreware or Cuisinart cookware sets, they are relatively cheap and of decent quality.