If you're having a problem building a simple three-skinner, let alone a Dutch Tulip or a Camberwell Carrot, Apple has recently approved an app which could be the solution to all of your woes.
Roll Your Own is an instructional App which offers step-by-step tutorials on how to construct... erm, let's call them 'specialist cigarettes', with nicely-shot video and pics.
The free App somehow managed to sneak through Apple's unfathomable vetting process, probably by never mentioning the C word, and has been given a 17 rating due to its "Frequent/Intense Alcohol, Tobacco, or Drug Use or References".
We'll leave the last word on this to reviewer Cesar Chirinos, who said: "Can't wait to Download it on my Kid's IPod. Now he can help me out as I Drive."
We laughed so hard we nearly dropped our doobie.