Catalina Crunch makes a pretty good one. Also you shouldn’t feel anxiety about eating things because you have a family history of cancer. The small bowl of Cinnamon Toast Crunch is not any more carcinogenic than you walking outside every day with the pollutants in the air. What we eat is definitely important, but that’s being overblown in today’s society. Regular physicals and blood work along with exercise and a balanced diet is probably way more important than a bowl of cinnamon toast crunch every morning.
There’s not any poisonous ingredients in any of those things. BHT is nothing to be concerned of at the doses you are getting from that cereal unless you eat 100+ boxes a day for weeks on end, and at that point, the sugar is more concerning.
The sugar is something to be aware of, but I wouldn’t care about the rest of the ingredients.