About once every three months really. No real pattern. I do it more often on vacation, but only if I find myself with the right people. And I don't know how to roll. So going solo (although I have done it to experience Dark Side of the Moon in a radical new way
) wouldn't be a habit, because smoking through the pipe isn't like pulling on a joint. I would learn how to roll...but I don't want to. I'd rather keep the experience of being high rare and enjoyable.