You had a final warning. You then committed an offence.
So you ask should you lose your final warning?
That's a 'Final' warning. A 'FINAL WARNING'.
FINAL.
I can't help but think there might be a clue in the wording of the warning somewhere. Can you spot it? Or has your brain been permanently befuddled by smoking endless joints 'hey! it doesn't do any harm! it should be legalised!'... try telling that to the victims of driving under the influence of cannabis use. Or the victims of cannabis psychosis...
I hope you go to jail and contract a tropical disease.