health warning

noun2

1. •
   An official edict that a particular substance or activity is dangerous, or an expression of such an edict.

   • The law requires a health warning on packets of cigarettes.
2. •
   (UK, informal) An indication or admission that an opinion, statistic, etc. is to be treated with doubt or scepticism.

   • As I am a member of that political party, my views must come with a health warning.