I tried Flash and thought it was useless. I also tried another product from FA UK called Bite Extra which although marginally better still didn't work. I did buy FW capsicum ages ago but never tried it but that will soon change.
I actually thought about this time ages ago but never found or heard of any such acceptable substitute unfortunately.
I came across another additive a while back but seems these things so far don't work. I like the 2th review on the Flash where the guy mixed it a 3% and even added Nic and still got nothing, that was funny. If it comes to the crunch, I might experiment with alcohol, hot peppers...lets hope it doesn't come to that.
Do you guys actually feel the need for nic like when you smoked? I used to withdraw a lot when I smoked but now absolutely nothing.