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Not parent, but this is a generally accepted thing, e.g. https://www.bumc.bu.edu/genetics/research/substance-abuse/ https://www.bumc.bu.edu/genetics/research/s

• ffssffss 4y ago
  That paper also seems to heavily qualify the findings, implying that environmental factors may dominate genetic ones (or may not, the point is that we don't know): However, these loci explain only a small proportion of the genetic variance. The “missing heritability” may be explained by other genetic mechanisms and gene*environment interactions