Well, I put Toronto in the search, but clearly didn't look long enough! Sorry.
And I second everything EG just wrote to you. After my RAD overdosed and nearly died, we believed her when she said she'd only tried heroin once or twice...we nurtured her and loved her and then my sister took her into her home in another part of the country, got her a job at her firm, a new bedroom, clothes, sought out friends her age for her, then BOOM. She couldn't keep up the facade...three months later she was back in our state in rehab, and it was not easy to get her, there even then, even when she had admitted she had a problem.
My humble advice: Don't let him live at home yet; set really firm boundaries and keep telling him you love him.