Most people entering counselling will be most surprised by this and are not expecting the drug counsellor to be of this mind at all.
However there is quite a sizeable group (most people) who use drugs and alcohol in a non problematic way. They use drugs and alcohol such that their life script is not advanced and their relationships are not damaged in any significant way.
The goal of experimental use is to experiment and find out what this thing called cannabis feels like. Once they have used a few times they have experimented and thus the reason disappears.