Just that we seem to have a level of empathy for other behaviours that people engage in that they know may be unhealthy/ dangerous that we don’t employ for smokers, as if they somehow aren’t deserving of it.
Yes, this is definitely a thing. Nicotine is rated in some studies as as addictive as heroin, and by others as being in the top 5, more addictive than methamphetamine.
Addictions all work pretty similarly, although nicotine I don't think, causes as severe symptoms during withdrawal as things like alcohol and cocaine, it is a drug that you become physically addicted to and therefore have a fight on your hands to quit.
I don't really understand the stance that alcoholism, or cocaine addiction for example, is viewed as an illness and the addicts worthy of help instead of derision, but addiction to nicotine is seen totally different.
Alcohol addiction is probably a lot more prevalent than smoking now, and probably more prevalent than we know because many people don't think they have an issue to start a, and are surrounded by people who think the same way, yet the risks are as publicised as with smoking, and it costs a lot in terms of anti social behaviour too, which smoking doesn't tend to, the effects of alcoholism are, imo, more widespread and common than for smoking.
It's interesting that alcoholism is seen as needing support and help, but smoking is not.
That said, I have recently quit. I wish I'd never started, but I did, and now I've quit.
I've quit because the time was right for me. Not because of all the bitchy things said about smoking, or even because of the health benefits exclusively.
I think your DH is being unreasonable, because he was aware of the situation, and he accepted it. He chose to accept it.
I do think you should quit though, it is honestly the best thing I've ever done, but because you want to, not because people on the internet are sarcastic, superior and bitchy about it, or because your DH wants you to, but because you want to.
As with any addiction, you won't be able to quit until you admit you have a problem.