LP,
I was in a very similar situation to you, I stupidly admitted to the Navy that I had tried cannabis, once, which is true. I later realised that this could potentially look like i was once a regular user playing my habit down. When I got to OASC i stuck to my guns as mentioned before on this thread, but made it very clear that "Yes i have come into contact with cannabis and on one occasion i was foolish enough to try it, but have not touched it since"
What must look a bit suspicious is 10 young guys in suits waiting to be interviewed who have captained their rugby team, climbed mountains, toured Australia and ... not once even seen or smelt cannabis?
One word, "integrity", the RAF love it.
Anyway, what i think is irrelevent, but to answer your question, i got in!
GF