Roommates

I work in construction and I travel from job site to job site as the company which I work for sees fit. On the current job that I am on we are working in lets say a remote area. The company is providing room and board for the crew which means that we have seven guys in a four bed two bath house. You may think that this is not too bad but let me assure you, it is. Five of the seven that are in this house are under the age of 25 and single. Five of the seven enjoy the recreational use of marijuana several times per day, so much that it may not be considered recreational. When I mention several times per day let me describe; at breakfast, lunch, immediately after work and a few times there after before bed. This poses a very uncomfortable situation for me for I do not use and do not approve of it. You may say that it is only pot and does not matter. Well, it does. It is illegal and against company policy. Our foreman lives in this house with us and he is well aware of what is going on, therefore, I cannot go to him with my concerns. If I go to the company and they do not care enough to do what needs to be done, then things really get uncomfortable for me. So what does one do? Join them? No. Bring it to the attention of the employer? Not a viable option at this time. Tolerate it? This appears to be the only option for me at this time. I hate it, but I have to live with it.