Great answers, ladies...
Yes indeed, any changes you make to your hair will damage it.
There are a few conditioning chemicals you can use that won't but even most shampoos will damage your hair a little bit every time you use them.
You want no damage?
Don't use shampoo.
Use a non-silicone conditioner instead
Avoid styling products
Don't use blow dryers or irons or any heat
Cover your hair in the sun
Be extremely gentle when combing.. comb only when wet with conditioner
Tie up your hair if it gets windy
Never use any kind of lightening chemical
You may find that using henna is non-damaging, though there is the possibility that it may make your hair more brittle (it can act like over-proteinizing)
You may find that using temporary colours do not damage. I highly recommend Goldwell's Soft Colour as I know how wonderful it is. But there are probably lots of good types on the market.. remember the longer they say the colour will last, the more the damage is likely to be. Temporary colours are highly pigmented and should wash out completely from virgin hair, so long as you don't have unusually porous hair. These colours never change your own natural pigment and only deposit pigment into the very top layer of cuticle.. without opening it. For darker haired people, the results are never very noticeable.. mostly just a highlight in the sun.
Be happy with your healthy hair and rock what you got by making the cut and condition work for you..