Betacarotene should be used by:

1. People who smoke, because smoking destroys vitamin A.
   
2. Vegetarians can rely solely on betacarotene for their
   vitamin A intake.
   
3. People who are exposed to smog or other environmental
   pollution.
   
4. People exposing themselves to sunlight without sun
   screen.
   
5. People who take a lot of vitamin C (stops vitamin C
   form oxidising).
   

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