If you use the same juice frequently, over time that flavor will diminish. This is known as "vape tongue" in some communities. When I vaped after kicking cigarettes I had 2-3 different flavors I would rotate to mitigate this.

I don't know about smoking / snuss, but does one brand == one flavour? Or is it like a "Doritos" situation where you have x different flavours of the same brand?