Two months and you slipped? Meh. Yeah, well, surprise, you're human.
You could try to do what I did. Make smoking inconvenient. Don't put all the stuff you used to use around nor nearby. Like we all used to do. You know, ashtray and lighters and pack in easy reach. I stuck mine in a kitchen cabinet. I'd let myself have a cig if I was just going nuts but I had to go get everything outta the cabinet and stay in the kitchen. The vapor stuff was handy and convenient. The cigs weren't. Sometimes I gave in. Sometimes I vaped like a maniac and kept going.
Stress? No surprise there. There actually, really are chemicals in cigs that have psychological effects. That "ah" calming thing you get from them? A lot of that is chemical, not just "in your head" (well, the chemicals race to your head and do the deed there so it is "in your head" but, heh, you know what I mean).
Stress is
the thing that makes me want a "real one" these days. So far, so good, but I can't promise I won't crack.
But you're smoking way less right? Good. Keep going. Rome weren't built in a day. Not even two months.
I would say try to avoid making it a
habit. Like keeping the cigs and all handy and nearby the way we all did. Like me, I was never without a lighter. I carried two. Always. You know,
just in case. Make the vaping easy and convenient, the smoking kind of a hassle.
But, wow, the bar exam? I can't imagine. I'm still trying to get over college "finals week" thirty years later.