Avoiding My Friends because of My Fear of Weed and Schizophrenia

Hello everyone. It's summer time and that means my friends from different universities are back in our hometown to hang out for the summer. I haven't seen these guys for like 2 years so a lot has changed. When I started hanging out with them again, I found out like 6 out of 8 of them have been smoking weed these past years. I remember reading something on the internet a few months ago that weed can cause Schizophrenia and I was very grateful that I don't smoke weed. But, after finding out most of my friends smoke weed, I've been scared to hang out with them in fear that I might get contact high and that'll make me Schizophrenic. I've also been afraid to go to one of my friend's house because I'm scared I might get some trace amount of weed in my hands and if I ingest that, that would make me Schizophrenic. I felt bad for not eating some of their cooked meals since I would feel that they didn't wash their hands after smoking before preparing the food. I'm also afraid that if I did get weed contaminants on my hands, I would spread the contamination in my house by touching other things (I also suffer from hand-washing OCD). When they do smoke, I would just stay inside while they smoke outside, but I would still get scared when they come back inside several minutes later and I would still be able to smell the scent. I've been neglecting to hang out with them for the past 2 weeks through text, sadly. I guess my question would be: Is this weed/Schizophrenia fear irrational and should I stop avoiding my friends? I'm sorry if this whole thing sounds a bit ridiculous, but I'm just very anxious at the moment. Thank you.

TL;DR Finally get to see friends after 2 years, but found out they started smoking weed. My anxiety and fears makes me scared to be avoid them because I'm afraid of developing Schizophrenia. Also afraid to touch things in their house since they smoke often; I'm afraid they didn't wash their hands and they would spread trace amounts of weed everywhere with their hands. Not sure if I should stop seeing them.