Some may experience nausea if people nearby are eating suspected foods. Peanut butter may be used to thicken chili, or to seal egg rolls. Bakery products and ice creams may easily be contaminated. Avoid all nuts. Parents of the susceptive person must be vigilant, and yet worry about a possible fatal mistake.
Most exposures are accidental.
Perhaps the answer lies in the counter-argument that if their child had the life threatening reaction, would they not be the first to demand that all peanuts be removed from the child's environment. Fortunately, many schools and summer camps have come to realize the magnitude of the problem and controlled the problem. Education of friends, relatives and acquaintances is essential. Divorce situations may pose a special threat where one of the parents chooses to deny the problem. Pure peanut oil is generally non-allergenic, but cold pressed peanut oil or oil contaminated with peanut protein through cooking may be dangerous.