Roasted marshmallows contain acrylamide. The chemical acrylamide is found in fried, baked, and roasted foods like coffee and french fries. Because acrylamide was discovered in food somewhat recently, we don’t have any concrete answers about whether it causes cancer, but scientists are uncovering evidence of a potential link. Existing research suggests that acrylamide is only dangerous in extremely high doses that humans are unlikely to encounter.