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					Originally Posted by  burn_this_city
					 
				 
				Everything is fine in moderation. Even smoking and drinking during exercise. 
			
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But in practice, smoking (and drinking for some people) is not something that can be done in moderation.  Nicotine, being so highly addictive, makes smoking so habit forming that breathing and lung capacity is affected.  It makes it hard to do cardio long enough to see any real benefits if you don't have the lung capacity to do it for more than 10 minutes at a time.
 
I started going to the gym back when I was a smoker (like 6 years ago), but it was pretty futile.  After I quit, the difference was like night and day.  The extra stamina makes it so much easier to get results and makes working out more tolerable/enjoyable.
 
It's funny because when I first quit smoking, I went through some weight gain like a lot of ex-smokers do.  I remember my doctor telling at the time not to worry about it because healthy bodies come in a different shapes and sizes and that it is better from a health point of view to be a little overweight than to smoke.