As a dedicated ball-point pen and typing enthusiast of the modern age, I haven't used a pencil in years, but I may consider trying this cool new Sharpie Liquid Pencil. This revolutionary pencil uses liquid graphite that writes as smoothly as a pen, erases like a pencil and becomes permanent like a Sharpie Marker after about three days. Unlike the in-between mechanical pencils, these also won't suffer from endless broken leads. Great solution for anyone forced to still use pencils, but I wouldn't chew on it!
Sharpie Liquid Pencil