it is detremental, causes an average dec of life expectancy by 10yrs compared to non-smokers and smokers have an abg of -7.5yrs taken off their lifes (idk i know its weird facts but thats what she said in the lecture)

it also majorly increases risk of

Cancer

CVD

COPD

overall it not be good

smoking = inc COPD

Transtheoretical model of behavioural change