As someone wrote here, the spray can cause hiccups. Yes, even if you take two puffs.
It is effective, but you have to practice a little self-discipline. Every now and then you want but a smoke, because the spray does not suppress the desire to 100%.
Who smokes a lot, like me, ok at the moment I smoke only half the cigarette (that you have to smoke the whole to be satisfied, is actually just my imagination). And if you, as one smokes only half the cigarette, so sometimes you have to go have a smoke often, that's a small step forward, when a whole cigarette dust at once.
It can be expensive if you spray only and zero smoke. The costs in 2 weeks already 24 Euro, if you comply with the recommended application because the spray is then empty (150x)
In any case, I find that the spray is better than gum, patches, etc. But wait a little expensive. That would be even cheaper, you want to make people with non-smokers, and do not start those this the eventually can no longer afford and to smoke again. Somehow or paradox?