I am 15 years old. I have told my mother that i smoke numerous times. She refuses to let me until im 18. I used to get stoned before school but I fucked up and *almost* got caught last week, so i will never do it again. Just not worth it. I still use after school and on the weekends. I try my hardest to keep my school work in line, i study hard, i work hard, and at the end of the day, i reward myself with a few nice bong rips on a friday afternoon. I do not view this as wrong. But, i think that although you shouldnt totally crack down on him, he fucked up and got caught, and you need to make this clear to him. sometimes we can go through life being confused as to what to do and what not do do, what to keep at and what to stop.
My two cents.