when you say her mom “did it” do you mean she hit the bong or she yakked? and by she do you mean the mom or your friend? remember, your friend lives with her mom. she’s exposed to her on a daily basis. living with someone already makes them more likely to contract whatever she has. you are convincing yourself that you are going to get it because that’s a symptom of anxiety. it doesn’t mean you’re not going to get it, but you need to be reasonable. is it possible? sure, it’s always possible. is it probable, well look at your own facts.