I did my share of inhaling in the past. I agree with the non-agressive thing, that fact becomes rather obvious after a while.
The one thing that still bothers me though is my gut-feeling that inhaling smoke can't be very good for your lungs. Here's a 2012 NYT article citing a study saying that it does not impair lung function, but again, just instinctively, I have trouble believing it.
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