Well, let's put it this way,

I was having chest pain, knew it was serious probably a blockage. I kept smoking thru the whole episode, tho I was careful about starting to cough and increase my heart workload.

I had a 98% blockage to the entire left side of my heart. I am still here, never had a full blown 'heart attack.'

Data can be made to say whatever the author wants it to show.