smoking/drinking/drugs all make your voice sound strained (check out a 1995 Grateful Dead bootleg, you'll know what i mean), so if your going for that and want to grow old real quick, smoke alot of persian ;).

But seriously, unless your going for a certain tone, i wouldn't reccommend smoking (cigarettes that is, marijuana is a-okay:D), and especially drinking in my opinion is just dumb (i go for the more herbal experience...).

I find that the more you practice singing, your voice starts to sound a little less like talking and a little more singing, and it gradually gets better over time (im only 14, so i can't really say what im gonna sound like in 5 years).