We didn't find out our son used marijuana until about a year after he started. He really hid it well, lived a double life, did several other things we didn't know about. Anyway, in the last year or so, he tells me more and more things and we can have candid conversations about this, though I'm sure he still lies about some things. He told me that he smoked marijuana every day while a freshman in college (and did quite well grade wise that year) and also drank alcohol. My husband and I drink no alcohol whatsoever. But what is so surprising is that he did this in his room. He lived at home during this time. I just can hardly believe this but there is no reason for him to lie about this. I am very observant and also has a very strong sense of smell and I can't believe I never noticed this. I only ever found one beer can outside and thought it was the neighbor's. Any thoughts? It just makes me feel so awful, though I know it is in the past.