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I smoke quite a bit of weed. It's not unusual to wake up, smoke 2 or 3 joints and then go for my morning run. 12KM a day, 6 days a week.
I have Asthma, although it doesn't act up much as an adult, but even still I smoke weed like a chimney and I have a lung capacity well above most average people. I train up to 4 hours in a single day and never have breathing problems.
On the flip side, when I used to smoke cigarettes I had constant problems with my Asthma, couldn't do any kind of exercising without winding fast, etc etc.
So from personal observations, weed is much less harsh on at least my lungs.
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