No. It is a myth.
No, lifting will not stunt your growth as the myth grows. But at such a young age you need supervision, and make sure you do it correctly. There are many benefits of weight training, even at this age.
Excessive weight lifting and working out can cause growth deficiencies in adolescents, yes. However working out in moderation is fine and can help muscle and growth development.
Lifting light weight with high intensity can stunt growth in children if used too early.
Lifting 40 pounds at the age of 13 can affect your growth. It can cause a persons muscles to become weakened later on. The age of 13 is too young to be lifting heavy weights.
not necessarily
I don't think any minor weight training will affect your height... however i recommend waiting until your 15-16 to start weight training and even then you should go very slowly and ask the advice of a personal trainer. No. It's a common myth that's been perpetuated for some time that weight lifting stunts growth. 12 year olds should certainly be supervised when lifting and instructed on proper form, but weight lifting done in good form should not stunt growth.
No. It's an urban legend that weight lifting stunts ones' growth. Dumbells wil certainly not do anything to affect your growth. If you ever attempt heavy squats (not dumbells), it's important to have proper supervision: poor form could result in an injury to your back, which might ostensibly stunt your growth. Barring an injury, however, you can do whatever lifting you like and not hurt your growth.
Weight lifting will promote muscle growth, while not using up that many calories. It can certainly make you put on weight.
Drinking Coffee: No. Urban legend, my friend. Caffeine may not be the best thing to be pumping into your body, but it does NOT effect your growth. Caffeine mimics hormones that are released from the adrenal gland. If caffeine mimicked somatotropin, a hormone which is responsible for growth, that would be different. But it doesn't. So no worries. Lifting weights: Err, indirectly, weight lifting can affect your growth, but ONLY in a good way! Lifting weights not only strengthens your muscles, it also strengthens your bones by increasing bone density. I wish more young teenagers would weight train. It helps prevent osteoporosis later in life; especially in women.
Appositional
Yes it does. If you are younger than 17 then your growth may decrees.
if you deadlift/squat with terrible technique then you can mess something up inside the spine, and decrease growth hormones produced But that's very unlikely to happen Lifting weights with proper technique does not affect growth