Is giving assistance to suicide a crime?

If you actually physically kill the person or physically help the person kill themselves (for example if you literally help them tie the noose from which they are going to hang themselves, or if they are so weak they can't even get out of bed and they ask you to suffocate them and you do it) then you just commited a criminal offence. I believe that if you also provide them with a weapon such as a firearm, rope (for hanging), knife, sWord, explosive, posion, etc... knowing full well what their intentions were then yes also I believe that is a crime. However... giving "advice" really isn't illegal as I really honestly can't see how they could possibly charge you with any crime based solely on what you say to them. The whole freedom of speech thing applies I believe.

Laws vary between countries and regions. Mostly, it is illegal.