My name is Matt, I'm 18 1/2 and 5'7''and was wondering if I still have time left to grow. My Dad was 6'3'' or 6'4'', my mom is 5'8'' and my sister is 5'8'' as well. I started lifting weights freshmen year and have been doing so off and on ever since. I bench about 245 and curl 125. I also started taking Dexadrine for my ADD when I was 15 and took them for about a year and a half. Would both of these factors contribute to my relativley short stature? or am I possibly just a late bloomer. Also, will smoking marijuana cause effects on your height? please reply back. Thanks.