People quit all the time. My dad quit in his 50s after a lifetime of smoking (and giving his kids asthma for it).
Jessica Alba is a co-founder of a $25 million dollar start-up (figures vary according to different reports) and she admits it's hard (hence smoking for stress relief): http://techcrunch.com/2012/09/10/jes...t-what-you-do/
Originally Posted by Jessica Alba