So you're 500% more likely to have schizophrenia when first-degree relatives are more involved. Another book cited by the wiki page claimed that 13% of people

So you're 500% more likely to have schizophrenia when first-degree relatives are more involved. Another book cited by the wiki page claimed that 13% of people with one parent, and 50% of people with both parents, are likely to have schizophrenia. These aren't hard and fast rules. People can experiment, but they should know that if they do psychedelics when first-degree relatives have the condition, then they're more likely to have it themselves. Just like many other health conditions.