Questionable content of Instructables - Questions Answered

I've got a few recipes for such questionable things as making a powerful poison out of cigarettes, and timed bombs, etc. Would these instructables legally be allowed to be posted? I am a firm believer in knowledge for knowledge's sake, and don't advise actually carrying out certain experiments like these, but I think that if someone wants the knowledge they should have access to it. (I can certainly see this liberal thinking backfiring in the case of a terrorist wanting to know how to bypass Pentagon security, or whatever other dire situation you can think up.)

So, allowable or not? I don't want my account deleted because of my ignorance of e-law.