Yes. See, for example, this overview of studies of identical vs fraternal twins and other lines of evidence shows that an average of about 50% (up to ~70% for cocaine) of the variability in addictive behavior can be explained by genetic variation.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3506170/

Yes: https://en.wikipedia.org/wiki/Addiction#Genetic_factors

Genetics, but also environmental. Children of addicts, IIRC, are close to an order of magnitude more likely to become addicts themselves (as compared to children of non-addicts)[0].

[0] Sorry, I can't cite that source ATM, just something I recall from foster parent training.

Short answer: no. Hereditary has nothing to do with it.

Long answer: if you’re white, under the age of 65, and live in suburban America — then yes, you are more prone to addiction because of your geographic make-up and likely have access to healthcare options that predominantly over prescribe opioids.

Sources:

https://www.nytimes.com/2018/07/05/podcasts/the-daily/opioid...

https://www.vox.com/science-and-health/2017/8/3/16079772/opi...

My family isn't exposed to any of that considering I'm the first among my kin born here in the United States.

As an aside, there's an interesting level of confidence in your initial response ("Hereditary [sic] has nothing to do with it.") considering that you're wrong.

https://scholar.google.com/scholar?q=addiction+genetics+dopa... — this may be a good starting point.

My train of thought is: addiction is one of possible symptoms of a certain method of dealing with stress; this method is learned behaviour; you learn from your close surroundings, i.e. family.

Genetic factors and certain socio-economic demographics are also more susceptible to addiction.