It WAS useful for quitting, until the tobacco companies leveraged vaping as a skirt around the regulations on cigarettes. Now those wanting to using vaping as a method to reduce/stop smoking have to avoid getting addicted to vapes instead.

Also, vaping is fucking obnoxious for non smokers, clouds of awful smelling residue, and plastic shit everywhere. I'd rather people smoked, ideally those e-cigs that burn tobacco but cut out most of the toxins.

That’s how I did it and what I recommend to my friends (who vape constantly). It’s two habits you have to beat, why not do them one at a time?