A:AnswerMost likely not, The noise cancelling is alright, But I would say if you turn the volume of whatever you listen to high enough, you wont head the lawnmower.
A:Answerusing for about a month, no damage. I expect the ear pads will wear, eventually, so I searched Amazon for "replacement pads Hesh ANC", and there are LOTS of options all under $15 ($8 was the cheapest)