Yeah stop stressing dude. I used to smoke heaps then cut down to weekend evenings only. You really do lose your immunity to it. What I used to smoke in 2 weeks has lasted me for 2 years and I still have heaps left. Sounds like you are smoking too much. Just mull up like 0.05 of a gram with 2 ciggys and have a few light pipes. Sit back and relax watching a comedy and next thing you'll know you'll be giggling your arse off and craving chocolate. If you start panicing just go and take a 15min walk. Fresh air and exercise cures all.