How on earth you can run those times while smoking is way beyond me, and I know you are definitely not the only one out there who can do this because I have seen it with my own eyes. Being a moderate or heavy smoker would make a 25 minute 5k a struggle for me - and I am not lying about that either.[/quote]
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I used to smoke 3/4 of a pack a day throughout college and beyond, yes..stupid.
As a D1 College Guy, I ran 10K X-C under 31:00 few times and sub 25:00 for 5 miles regularly, then a 2:23 Marathon after college in 1982.
I stopped smoking in 1999 after 22 years and have never reached my age graded performances I hit when I was young. Now, guys I crushed in College are beating me.
QUIT NOW if you are smoking.