I thought it was great when they legalised it (even though I don't smoke). Then the shops started opening everywhere, and I remembered how cringe stoner culture it!
as an experiment, I didn't leave the house without my passport for three months in Chiang Mai, either in my pocket or hill tribe bag, everywhere I went, even out getting absolutely smashed. I never lost nor damaged jt.
an international driving permit, yes. If you have a full UK car license the RAC usually endorse the bike stamp on the IDP. As far as Thai authorities are concerned, the average UK car license appears to have bikes also, it's how I got my Thai bike license.