I pretty much keep them on hand to sell my friends. Its a must. I just dont like sharing bongs. Just so much more sterile to say its never touched anyone's lips. and i dont like all the cleaners and such. Nothing worse then a big rip and tasting alcohol vapors. Ive gotten them at bulk price for like $3 for the basic ones and like $6 for the filter one. Now pretty much everyone i know has one. Only end up getting one when they forget it when they come visit. these have been a game changer. Was a company for years before them that used to just make the little sleeves like acrylic bongs have Id always see randomly at smoke shops. I used to just buy those for a few dollars and just give em to people when we'd share a bong. So this is 10000x nicer. then the little plasti dip old school ones.
Side note: The filter really helps block droolers. Just a Pro tip. So if you have that friend that takes big rips and always drools. Game Changer right there!
For me smoking with someone is largely smoking separately at the same time. unless its my significant other. Thats only exception. Ill roll a joint for people if they want to share it. Its nothing personal, just not my style. Some people do get offended by that.