Why can t I build a tolerance to opiates?
You are confusing a tolerance to a drug with a tolerance to the side effects of a drug. You are one of those people who get sick from narcotics and no matter how long you take it or how much or how little, you will still get sick from it.
Genetics. It is not uncommon for our body to reject harmful substances. In fact, drug addictions as well as smoking addiction and other types of addictions are a metabolic condition according to pharmacologists. That's a positive thing that your body is defending you from harm.