Will this work without buying the lightning adapter thing?

Everyones saying iphone users need that lighting to 30 pin charger however isn't it possible that i can just unplug the wire from my ipad charger and plug the iPhone 5 wire into the adapter of the Ipad then plug that into the wall socket? I tried that and it seems to be charging perfectly fine without the 30 pin thing? But will it cause problems for it?

The ipad charger can deliver up to 1 amp.regular chargers only do 0.5 amp. Otherwise little difference

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