There's another reason I started this thread; the main reason actually. I was always too afraid to commit suicide because of my fear of death, and I was always afraid to pursue a deeper understanding of atheism because of it and past experiences with other atheists. But in my last post I guess I pretty much answered my own question (even though I didn't write it). Though lack of eternal consequences may result in a person who is more likely to commit suicide, the real answers lie in morals and ethics.
A person with a good foundation in these probably is no more likely to resort to such an extreme than anyone else.
Btw, I'm not suicidal, even though I have seriously thought about it in the past. I'm okay. It just seems that I keep that fear of death always at my fingertips in case things get so bad that I consider it again. But I realize fear of death isn't necessary, because I am a moral and ethical person with a conscience.