My mom caught me a few times back in high school but stuff was so messed back then that she just kinda accepted it as a phase. after i moved back home after ditching my cheating ex fiancee i directly approached my mother (my step father smokes pot, but he's a douche so we wont get into him) and said "Mom, while im living under your roof i want you to know that i still smoke pot. I don't do it for the same reasons i did back in highschool, nor do i do it with the same frequency or goal". She appreciated my honesty, told me she didnt like it but there wasnt much she could do, nor did she feel she could critisize me on it since she was married to a jack ass that smokes as well.