nope not bad at all, infact alot of home-made gravity bongs use that very idea. just make sure no plastic is burned because it can be very dangerous. Enjoy, btw Try making a gravity bong. Get you ripped right.

:thumbsup: How to make a Bong, gravity bong, Water Pipe, Waterfall Bong - Concept420 - Marijuana Entertainment and Information

Enjoy my friend and welcome