The more times you use your charger the less efficient it becomes?

So is this true?
I heard somewhere that the more times you use your laptop charger, the less effiecient (i.e. slower to charge) it becomes.
I also heard it is very bad for the charger(as well as the environment) to leave it plugged in while its not in use.
Can anyone shed some light on this?

Neither of these crackbrained notions is true, though the adapter does draw about one watt of AC power when it's plugged in and nothing is connected to it. Leaving it like that 24/7 would run your electric bill up by nearly a third of a cent per day, if you never plugged the MagSafe into your computer at all. Whatever else you're doing with your life has a heckuva lot more impact on the environment than that does.

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