Failed but have set new quit date

A little disheartened at moment.  I went away to a beach house with partner and friends on weekend and I smoked half a packet of smokes!  I had feeling this may happen but I thought I could beat the cravings.  I have decided to give up drinking for a few months until the initial cravings pass.  I have been eating badly too and haven't been to the gym in 4 days.  I was doing very well and felt great after 9 days of not smoking.  The first drag was discusting but then I ignored it and smoked anyway as everyone else was having fun and I felt left out.  How stupid, I now don't feel like I was missing out of anything and feel sick, chesty, fat & unhealthy.  I set my new quit date for tomorrow, wish me luck!  I can do it, I hold the power :)