Same as I told Siegel:
What a dishonest study. Note how they refer to continuing smokers as "failures," although their subjects were recruited on the supposed basis of having no intention to quit. It makes one wonder why they obediently trotted off to the quit-smoking clinic despite not being compensated for their trouble.
Out of 300 subjects eligible, they ended up with 190, of whom 45 were lost. No differences in outcome were seen between continuing smokers, reducers and quitters among the the 145 remaining. The supposed reductions in blood pressure were among 66 cherry-picked for elevated blood pressure at baseline, who probably had "white coat hypertension." So it's just another piece of anti-smoker crap, propped up with all the fraudulent anti-smoker speculations that blame smoking for heart disease that's really caused by infection.