Clones : How much of plant until not safe?

[smoothy]

Hi All,
Trying to find out, how far up a plant i can go for clones until it is unsafe for plant. Thinking maybe half way up? Looked all around and can't really find an answer.
All replies are appreciated :)
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[Purple Daddy]

I've taken them from lower branches so not to disrupt the newer growth. FWIW

[GaGrown]

You should take the cuttings from the lower part of the plant and not the woody part.You not gonna kill it or anything,so don't worry!

Ga..

[smoothy]

Thankx for replies-i usually take'em from lower down but not many, i need a good amount now as my friends are bothering me for em!