A Cochrane review by the University of Bath published in March 2021 said that,
"Smokers often believe that cigarettes are the crutch they need when they feel low, but there is good reason to think that smoking is actually making them feel worse. The daily cycle of waking up with cravings, satisfying the cravings through smoking only to be back wanting another cigarette within hours has an understandable impact on how people feel. But get past the withdrawal that many smokers feel when they stop, and better mental health is on the other side.
"From our evidence we see that the link between smoking cessation and mood seem to be similar in a range of people, and most crucially, there is no evidence that people with mental health conditions will experience a worsening of their health if they stop smoking."
Speaking on No Smoking Day, Deborah Arnott, Chief Executive of Action on Smoking and Health said:
"After the year we've all had, some smokers might feel now is not the time to stop. The opposite is true, put smoking behind you and a brighter future beckons. Using nicotine replacement, whether patches gum or vapes, can help deal with any withdrawal symptoms, which last at most a matter of weeks. Be confident that once you've put smoking behind you not only will you be healthier and wealthier but feel happier too."