Nepalimato bro, 

I've heard the same about smoke shops too. One guy was telling me that you could make $4k/week after deducting all your overhead costs etc. Can you open one despite having limited/no knowledge on Cigars, cigarettes etc? I mean, I've never even smoked a cigarette..let alone weed....

Location shouldn't be a huge problem as I live around the Hippie Capital of the world... 

Also, what about the start up cost? Gas Stations are a tad pricey, aren't they? What sort of capital are you looking at while opening a Smoke shop?