I dunno, I think it probably has its place as one of a range of options for those wanting to quit. Someone in the comments was talking about how Zyban works in a similar way (when it's not making you suicidal). I suppose it's committing to going through cold turkey and once you've had the jab there's no going back - by the time the enzyme is out of your system, the withdrawal period is over - all you have to do is not relapse (which as we all know is easy peasy 
). If this new drug could do what Zyban does without the hideous MH side effects I think it could help some people who wanted to quit. It's early days though, so far they have discovered the enzyme and found that it can survive at body temperature. They have no idea what will happen when it's injected into a human being - could be worse than Zyban.
What is far more sinister and dangerous is the 'end game' proposal to gradually lower the nicotine content in all cigarettes. That will definitely result in people smoking more to compensate and greater death rates as a result.
The truth is though that public health don't give a flying fuck about current smokers. All their efforts are focused on stopping young people starting in the first place and if current smokers die in greater numbers because of their measures, well, they're just collateral damage and nobody cares because smokers are scum anyway 