Here it is - increased risk of stroke due to tiny tearing of the blood vessels in the neck.

I hope you can access these articles - I'm currently on a magic library computer cleared for all sorts of subscription-only stuff.

Stroke after chiropractic manipulation as a result of extracranial postero-inferior cerebellar artery dissection.

Hyperhomocysteinemia: a potential risk factor for cervical artery dissection following chiropractic manipulation of the cervical spine.

I nag because I care. It's just something to consider. After all, there are pretty much NO medical treatments without risks and side effects. But you should know what they are in order to make the right decision for you.