Pharmacology - Genetic Codeine Tolerance

[mattdoesexist]

Hello all, I have a question regarding the tolerance buildup of codeine. Well, SWIM was prescribed a cough syrup by his doctor containing codeine. After learning more about the drug and the specific syrup online, he went to Erowid to read some of the experience reports regarding codeine. He figured a dose of about 120 mg would be enough to give him a satisfying high for his first time. However, after the initial 120 mg dose of liquid codeine, he noticed no real effects other than some mild tiredness, although he had been up for almost 24 hours, so he attributed his fatigue to that. He knows his father has been struggling with opiate addiction (heroine and cocaine... I believe cocaine is an opiate, no?) for the past 20 some-odd years, and he believes that his father was an opiate addict at the time of his conception. SWIM has noticed that whenever he pops pills containing opiates, he never feels an effect. Never a body high, never a mental fogginess or giddiness or euphoria... not the slightest bit. He even sometimes makes sure to go above and beyong the recommended recreational dosage and nada. My question is, is it possible that SWIM's father's built-up opiate tolerance has been passed down to his son? What are the properties of opiates regarding childbearing? Note: SWIM's mother has never abused opiates, to his knowledge. If you need anymore details in order to help answer my question, feel free to ask me and I will ask SWIM for clarification. Thank you for reading