Poisonous houseplant?

Do you have a poisonous houseplant lurking in your house? Chances are you do.


For Fengshui reason, i keep this plant planted at the main door for years and recently i read an article and got to know that it is poisonous and would cause us cancer. I made a deeper research on this and got a conflicting answer saying that this plant can actually be used as an air purifier, it can rid the air of the organic chemicals and toxins that cause asthma and other ailments....? HUH? so which is true??!!???

I'm going to remove it, anyway...
But tell me if you know it is harmful, or not?