My sneakiest trigger is the shop talk at meetings. I'm half kidding here, but there have been a few moments where I thought, "Golly! All this talk about drinking makes me want to drink!"
Good thing there was some important context added to the talk about booze...
When I'm not at meetings, the thoughts come up frequently - often on their own, often triggered e.g. when people drink on TV - what glamorous lives! what full glasses! I have to give the context of why alcohol is not for me. Sometimes I have to sit down and make a list.
I'm hoping this gets a bit better with time...