It's a terrible habit and it just goes to show how tactless and stupid some people are to smoke around other people without asking permission. I would ask him to stop, arguing that you are sick of this smell, and you feel bad. offering to just stop. My friend also smoked a pen like on the site https://hempercamp.com/shop/baked-hhc-vape-pen-blueberry-cookie-1g/ but since we are on good terms with him, we quickly found a solution