What’s the most dangerous chemical to be included in foods/drinks, and what percentage of it was included? (If there

Question: What's the most dangerous chemical to be included in foods/drinks, and what percentage of it was included? (If there was a larger percentage, how would it affect the consumer)?
- Keywords:
  chemical,
  drink,
  food
Asked by Jo1 to Deborah on 14 Jun 2016.
- Deborah Prunty answered on 14 Jun 2016:
  
  Everything is dangerous if too much of it is consumed, or if it’s combined with the wrong things.
  
  The most dangerous thing that I have found in counterfeit drinks has to be methanol. At low levels it will make someone feel ill. At higher levels though it can cause the consumer to go blind, or even die.

Question: What's the most dangerous chemical to be included in foods/drinks, and what percentage of it was included? (If there was a larger percentage, how would it affect the consumer)?