I use the same newspaper to start as @DextersShed but then i use pine needles ( it is dirt cheap to buy a whole bail for less than $5, and the resin smokes great). Once the paper is lit, put a little pine needles in, few pumps until you get lots of smoke, more pine needles until, more pumps, more needles, more pumps. Continue until the smoker is pretty well packed and filled. the other key is to give a few pumps of air now and then while inspecting your hives to just keep it going.
Using this method i have had a smoker go for in excess of 90 mins and then still needed to dump the unburned (all be it blackened) remaining pine needles.
If you do dump them do it in a fire safe place like a fire bit because it is very common for those unburned needles to spring into fire when they get a bunch of air around them.