okay i'll add my two 'sense'
i'm 28 and have been smoking for 13 years or so
at 24 i started my own business, struggled at first as all start-ups do
now 4 years later i make a very comfortable living
bought a modest house at 26 by myself and for myself, my wife, and my child
i grow my own to use (never sell my babies) and give some to a close circle of friends
i'm in the best shape of my life physically and mentally (non-tobacco user)
cannabis helps me with relaxation and back pain

point is...i have been very successful and the notion that cannibis ruins your life whether you are noticing it or not is assinine, you know if your doing the right thing or not and what your priorities are. people can ruin their lives with bad choices they make. i choose to smoke after the day is done and my work has been completed. nothing is more satisfying to me than sitting down and smoking a joint...and realizing i have done all i could to this day, to help my family and help my business. i agree with the moderation comments...you have to be in control of the choices you make and accept the consequences of those decisions. all i can say is, keep on smoking, but take care of your responsibilities before you do...it makes smoking that much more enjoyable.