Smoke effect- envelope distort spacing
I am trying to create a smoke art brush for an illustration. I transform>copy a thin line multiple times, using the pen tool draw a curved line, but when I place the curved line on top of the grouped transformed lines to object>envelope distort>make with top object, the lines are spread out. I have tried changing the spacing when copying the straight lines and that doesn't work. I apologize if this doesn't make much sense. I am still learning the terms and tricks of the adobe world. Thanks in advance. 
