It would be nearly impossible to knowingly live with a person selling drugs and to not be involved in a conspiracy of some sort. Just because you don't directly profit from some sale, you will almost assuredly be tainted.
Drug dealer: "Oh, that's my guy, will you open the door?"
You: "Sure."
You just committed an overt act to accomplish a drug sale you knew, or should have known, was going to happen.
Drug dealer: "Since you're going to the store, get me a box of baggies."
You: "OK."
You just committed an overt act to accomplish a drug sale you knew, or should have known, was going to happen.
Ring-ring, You:"Hello."
Person you know has come to the house in the past to buy drugs from roommate Ray: "Is Ray there? Put him on."
You: "Ray, it's for you."
You just committed an overt act to accomplish a drug sale you knew, or should have known, was going to happen.
Now you may not be charged in any of those cases, but it is highly unlikely you would not be legitimately suspected and hassled beyond belief. As I say with all my drug posts, I have a Libertarian attitude towards drugs. People should be free to be stupid if they so choose. However, the laws are quite clear and a substantial portion of the population think drugs are beyond evil and those associated with them should be severely punnished. This attitude is known by everyone in society and I guarantee you nothing good will come from ignoring that fact.
Also, bad things seem to happen to drug dealers other than legal ones directly related to the crime. They tend to do other illegal acts. They tend to have other illegal acts done to them. Crime and violence follow those involved with the sale of drugs. Some (like me) might claim this is primarilly because of the illegality of drugs and not the inherent behaviors associated with it, but one cannot deny the direct relationship. Do you really want to be in with this culture? Do you really want to put yourself at such risk? Remember that the type of risk we are talking about is *life changing* risk. You will never be the same when something bad happens in a drug environment.
Choose wisely. No one will feel sorry for you if you choose poorly.