yeah, but plastic bongs can break too (just not as easily), and they are much less pleasant to smoke out of. it's not easy to break a glass bong as long as you're being careful with it. they're usually pretty thick. i always assumed it's just because you're more likely to cough after taking a huge hit. so it's not necessarily the cough that makes you higher, it's just an indication that you took a good hit that will make you higher. but that's just my guess, i really don't know. as someone who has smoked a lot of weed in my life, i can definitely vouch for the validity of the statement.