It could be solid glass, and people wouldnt think it thick enough to lose the China image......... I dont think you can convince people one way or the other, they already have their mind made on the way to the glass store of what they think is shitty and what they think isnt shitty. Its weird, I dont get it much myself..... The #1 brand of clear glass sold to glassblowers in the USA? China clear glass..... All them heady pipes arent always made from the best equipment!
Thickness, also, is a misnomer. Some of the headiest pieces out there are 1-2mm thick. Its about the construction, making everything into one flowing piece that wont break from stress, and using the best color and ornamental decorative work possible...... If glass has inconsistencies as a percentage of the tube or rod, the argument could be made that the thicker the tube and hence more glass, the more potential stress it packs which can create more breaks than it protects......