The first thing you should know that even though no exam life insurance seems more convenient, most of these policies cost AT LEAST 2 – 3 TIMES MORE than policies which do require an exam.
If you are young and healthy, or even older and healthy, we would not recommend that you apply for a no exam policy if you want to save money.
We would generally say you should never buy a no exam policy unless unless you are afraid of needles and the paramedical exam process, and want to get coverage prior to seeing a doctor about it.