Cause

[anise]

Which one is correct?

1. Microchip insert causes health hazards to those who use it.
Or
2. Microchip insert causes health hazards for those who use it.

To cause something for someone or to cause something to someone?

 

[emsr2d2]

Both sentences require an article before "microchip". As "microchip insert" is a singular noun, it attracts a singular verb.

I wouldn't use "cause" at all. I'd use "is" and "for".

 

[jutfrank]

I agree with emsr2d2. It doesn't make good sense to say 'cause a hazard'.

Use this: cause a problem for somebody/something

 

[Tdol]

Implant?