Hi, I Recently Miscarried. I Was 12 Weeks Along When

Hi, I recently miscarried. I was 12 weeks along when I found out it had died at 8 weeks 6 days. It's been a week and 2 days since I naturally miscarried. I've had little to no bleeding now for the last 3 days. I used to smoke weed every now and then before I got pregnant. I used to drink and smoke cigarettes also, but I gave it all up once I found out I was pregnant and saw my baby's heartbeat. It was the only reason I gave up everything because it meant the world to me and I gave it all up happily . Now,I've been really sad being that it was my 2nd miscarriage and I've been really affected by it that I just want to cope with my old habits. Can I do so?