It kind of depends on what you mean by talking about suicide. If you wanted to discuss it in a kind of philosophical way I could understand but I'm not sure how many people would want to be part of the discussion. If you wanted to tell us you are going to do it then I wouldn't like that. I'm pretty sure most people would be uncomfortable discussing methods.
Nobody stops anyone who is really determined to commit suicide. I see that shezbut edited your post but only to add a trigger icon, so you're okay so far.
Maybe if you gave a hint about the type of discussion you want ?