How much can be forced the height?

[foidslayer115]

Like i don't know how much genetic Is and what habits and healty condition can do cause i know people smoke drink and are drug addict be 6'4-5 and their parents are above 5'7

 

[Mazilias]

Like i don't know how much genetic Is and what habits and healty condition can do cause i know people smoke drink and are drug addict be 6'4-5 and their parents are above 5'7

Mostly about genetics GH and erda can give like 4 inches max i would say