I've been around my mom probably 10 times when I was stoned, once was literally 5 minutes after I hit a pipe while sitting right next to her. She didn't notice, but I'm sure she was somewhat suspicious. My mom is a nurse, so shes people under the influence of all sorts of drugs, but I guess I'm really good at covering up.

Remember to wash your hands after. They hold the smell of weed for a long time, ecspecially if you're using a joint or blunt.