Notice also that while they are running those disclaimers of physical disasters, the video is of implied-diseased, elderly people laughing, smiling, enjoying exercise, nature, family, etc. to deceptively confuse you. Your mind cannot reconcile the dichotomy of the happiest images of life with the spoken "potential" vile physical ramifications, so it discounts the bad stuff and only remembers the happy thoughts.

p.s. "to give birth to a fully-grown Tim Conway." Yikes!