Well, it's your own personal opinion then if you don't want to smoke and you find it disgusting, and I respect that. There's nothing wrong with that train of thought, everyone has their own preferences. For some reason, I actually find smoking incredibly unattractive on females (not intending to be sexist) but I just don't like the way it looks. I don't know, but that's just me. I personally don't smoke but I'm fine with it, majority of my friends are smokers and I don't think there's anything wrong with that. It's just a lifestyle choice similar to gaming. Sitting 6 to 8 hours or more everyday on a seat immobile looking at a monitor must be bad for you lol.
Besides, literally everything kills brain cells these days such as my above sample of excessive gaming. How often can you walk outside and see a bunch of little kids playing ball anymore? It's probably one of the things contributing to the increasingly common weight problem. In comparison to many, many things people are doing commonly nowadays, smoking marijuana isn't that bad. I only advocate smoking marijuana because I don't find it as detrimental to your health as many, many other things that are already legalized. It's already literally on the streets anyway so what's the point of trying to stop it? It's just wasted resources trying to stop people to smoke marijuana. It's like telling a fat kid to stop eating McDonalds. If anything, regarding my above statement on the increasing weight problem, McDonalds should be regulated. Whether or not you're located in the USA, I'm pretty sure you've heard about the "obese epidemic" all over America. Shit tons of people are getting fat; which as everyone knows is incredibly detrimental to your health such as increased chances of organ failure, diabetes, high cholesterol, and etc. If anything, people should be more worried about the McDonalds that's almost on every other block nationwide where you can just walk in and eat 1,000 calorie meal for only like $5. There's shit tons of bigger problems and people are totally blowing marijuana up into something it's really not.
Whether or not you want to smoke marijuana should be left to that person, but you shouldn't try to push your views onto them. Of course they know there's side effects to it as there is everything else but they chose to do it anyway. If you don't like it, then that's your issue. No point to just go around telling everyone "omfg, stop smoking. Do you know how nasty that shit is?