The studies that I remember looking at when I was working did not show a link between lung cancer or COPD and marijuana smoking. But the caveat was always the amount being smoked. If you're an ex cigarette smoker, you probably smoked a pack a day or more. Usually, pot smokers usually only have a few joints a week. If pot smoking increases now due to its legality, we may very well see the same links between it and lung disease and heart disease we now see with cigarettes.
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How we spend our days is how we spend our lives. We make a living by what we get, but we make a life by what we give.
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