This 3 sentence summary provides the essential information from the document:
The document describes an interview with someone whose grandfather smoked his whole life and was told by his mother that he needed to quit smoking to see his grandchild graduate, which caused him to cry realizing what was at stake, he then quit but sadly passed away 3 years later from lung cancer which emotionally destroyed the interviewee. The interviewee's mother then told them to never smoke and they agreed, however at age 16 while never having smoked themselves they feel regret for not trying it because a Reddit post gave them cancer anyway.
