& to the Planet Joanne!
Switching will be the best thing you'll have done in years! I quit 2 months ago...don't even think about smoking anymore.
As for a more compact mod...well you already have the Nautilus 2 tank....the mod that works well with that tank is the Aspire Zelos.
The Zelos starter kit, was my first purchase, as it came with the tank....it's all built in...has a USB port for charging..and is very very compact and lightweight. You could try that mod. I think the mod on it's own is around £30 or so...I bought the kit with the tank, which cost about £40.