Adams J.D, Erickson H.H and Stone H.L: Myocardial metabolism during exposure to carbon monoxide in the conscious dog
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9 out of 10 smokers started before they turned 18 years old WHAT HAPPENS WHEN YOU QUIT SMOKING IS: after 20 minutes, your heart rate and blood pressure returns to normal after 12 hours the level of Carbon Monoxide returns to normal after 72 hours your lungs start clearing out the build-up of tar, your energy levels begin to rise and breathing becomes easier after 1 to 9 weeks, the "smoker's norms" like the constant cough and shortness of breath become less pronounced
Using Respiratory Protective Equipment When Outdoors
But seriously, for many people, its very difficult to break the addictive habit
