lol hadn't thought of the Smoker's Hypothesis

It sounds like you might be talking about disposable cartridge razors or all-in-one disposable razors, like the BIC Sensitive razors.

We'll recommend that instead, you buy a double-edge razor, which uses small replaceable double-edge blades that you change out every seven to thirty shaves.

This wiki talks about double edge safety razors in the "Removable Blade Razors" section. https://en.wikipedia.org/wiki/Razor

Across the Spider-verse is a blast, but as a warning, it's pretty long. Might want to go without any pre-movie beverages.