What KIND of nanotech, FFS...?!

are asbestic for avoidance.

I'm thinking replicators,
I'm thinking replicators,
I'm thinking respirators

remember the Borg in startrek!
they used nanotech, and it was very very bad!
(unless you get a kick off becoming a collective hive mind non-reproductable automiton (that means no sex life! - ever! btw)
(then again most of you lot have never had much more experience than watching pron anyway;)

but carbon nano tubes could cause damage to cellular walls(think lots of little syring needles loose in the blood) and if in sufficiently huge number could cause a lot of/fatal damage to a targeted bio-organism.

How can a "tech" itself be bad? Some of its possible applications can be bad, but how can "nanotech" be bad?

Nano products do have some great use and potential. There are also potential risks involved, and right now we don't know exactly what the risks are or how big they are, which is a problem.

Asbestos was once considered to be very good for a broad variety of applications, now we shy away from it.

There are other examples as well: Radioactivity, Agent Orange, DDT and tobacco, just to mention a few.

Finally one should also mention the increasing levels of electro-smog (broadband EM radiation) that we are exposed to every day. No conclusive evidence regarding long term effects on the human body have come up, yet.

The mix of potentially hazardous factors will make it extremely difficult to tell which of the factors that do the harm, once we start suffer all the ill-effects.