Can't really see myself getting into a serious relationship for various reasons. My expectations of people have changed over time, I used to always say that I need someone to be intellectually challenge me, but as I got to know different people from various walks of life through things I'm involved in, I've found that it's possible to have an interesting conversation with almost everyone (the only exception probably being an unabashedly sexist, racist and homophobic person who refuses to engage with the other side) if we put a bit of effort into getting to know them a bit better, being non - judgemental, not putting ourselves in an elistist/epitome of intellect position and giving them the opportunity to engage in deeper issues. I probably have tolerarant/not tolerant of different things to most people because of the way I grew up, but here are a few potential deal breakers:
-Sexist, homophobic or extremely capitalist minded (I think capitalism is ok but not to the point of constant endorsement of survival of the fittest theories, it just gives me the impression that they are a selfish person)
-Elitist and arrogant
-Clingy, possessive, impatient or pressuring me with family stuff (this is a big one for me, I need someone to understand that closeness, accepting or giving love doesn't come naturally to having never grown up with those things)
-Severe lack of understanding of mental illness
-No mobility (I probably need to compromise on my part, but I'm not sure where life will take me, so flexibility would be great)
Smoking is fine by me, there are various reasons why/how people got into smoking (I did it when I was going through a tough time). Plenty of my friends smoke, many European people do so. Obviously I encourage someone I'm in a relationship to quit for the sake of their health. Drugs are ok for similar reasons, although they would need to quit as the relationship progresses. Drug dealing is definitely unacceptable though.
Regarding loyalty, I don't know, I find it difficult to commit myself to one person because never grew up with relationships involving commitment and intimacy. But honesty is essential, even if open relationships.