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 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.