Everything causes cancer these days. It doesn't matter anymore what we eat.
Everything
does cause cancer to varying degrees. It's all a big probability game; even a huge blast of ionizing radiation isn't guaranteed to cause cancer but it increases the probability so much it is likely.
Cancer statistics can be misleading because something doubling your chance of cancer could mean doubling something that was 0.0034% likely to happen to begin with. Providing numbers as percentages and saying, "increases your chance of," are typical fear-mongering tactics by vegan groups.