Thousands of people around the country are using high-CBD marijuana.

Jackson Leyden had always been a healthy kid; he practiced taekwondo, and he played lacrosse and baseball. But in 2011, a few months after his eighth birthday, he began having seizures several times a day.

Many were brief, a half-minute of staring into space, but he also had severe episodes in which he would collapse, sometimes injuring himself.

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David Kohn ~ WashingtonPost.com ~