Not trying to make this tread too serious but anyone who actually thinks weed doesn't harm your lungs is just in denial . Smoke is smoke and will harm your lungs. My mother passed away a few years ago. She had a stroke but what caused he to pass was her emphysema that didn't allow more oxygen to get to her brain. Emphysema caused from smoking pot...
So according to me, pot is even lethal. She was only 48 too, so age had nothing to do with it. And she did smoke it since she was about 14..