“substitute the old routine for a new one. Electronic cigarettes, for example, are being used increasingly by smokers to substitute a more pernicious habit (smoking tobacco) for one with much less severe health implications (vaping electronic cigarettes). In these instances, note that the cue that triggers the behaviour can remain. It’s just your response to the cue that changes. This of course can be especially useful in those situations in which it’s going to be tricky to change the cue – for example, if you smoke in response to stressful situations.”