It's found a lot, particularly in the part of the kernel (Tenjin-sama); if eaten in a sufficient quantity, poisoning with hydrocyanic acid can develop, which, in the worse-case scenario, may result in death.
これは特に仁（天神様）の部分に多く、多量に食べると青酸中毒に陥り、最悪の場合は死に至る可能性がある。