Corrected entry: Clark goes to Lana's house to give her back the meteor rock necklace. As he is starting to put the necklace on the door knob. Lana calls for Whitney and you hear the "whoosh" of Clark using his super-speed to get away from the door. Kryptonite weakens Clark's powers so he should not have been able to speed away with the exposed necklace right in front of him.

Smallville (2001)
1 corrected entry in Metamorphosis
Jonathan Kent: Are you okay?
Clark Kent: Can I answer that in about five years?
Jonathan Kent: Yeah.
Clark Kent: Dad I'm glad you and mom are the ones that found me.
Jonathan Kent: We didn't find you, Clark, you found us.
Question: Throughout the series, people mutate fairly soon after their exposure to kryptonite. Is it ever explained how Lana has managed to wear a piece of kryptonite around her neck for 12 years and not change?
Answer: The kryptonite only creates mutations when it reacts with the environment and an individual. Remember, the FDA and several environmental groups did check out Smallville after the meteor shower, but found no danger in the rocks. Obviously they're not always emitting mutating rays, or all the flora and fauna of the surrounding area would be horribly mutated.
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Correction: He took a few normal steps back to get out of range and then he super speeds off.