i prefer the term "herb" as it is a plant that comes from the earth that has medicinal properties.
yeah there might be damage from heavy smoking but it is VERY minimal. i've smoked since i was 18 (28 now) and my lungs feel health as ever. i have no coughing or problems outta them as most cannabis smokers don't. hell, i'd like for you to show me someone who smokes pot and has problems with their lungs.
and btw, it's been shown cannabis helps people with asthma breath easier as it relaxes the lung muscles and allows more air to flow in. while i'm not saying it's totally health, it's a FAR cry from dangerous. so please stop with this "abusing" as it's hard to abuse cannabis(unless you smoke shcwag and that don't count ).

hell too much water can be harmful but do people rant how some need to stop "abusing" it? 8)