Nicotine
The first three days without nicotine
The first few days can feel disproportionally difficult because nicotine is falling while routines and cues are still everywhere.
Days 2 to 3 can be hard
HSE says people may experience the most cravings two to three days after stopping.
Discomfort is not failure
Irritability, anxiety, sleep changes and concentration problems can be withdrawal symptoms rather than proof you cannot quit.
Support is allowed
Nicotine replacement therapy and stop-smoking support can reduce withdrawal. You do not have to turn quitting into a willpower contest.
Use the tool: choose a realistic next interval, return and answer honestly. A NO does not erase previous choices. The timer is not a substitute for medical treatment.
Sources and further reading