You can get nicotine from patches/gum - there is no need to smoke cigarettes. Most people who smoke do so out of social pressure, because they are retarded - if they really believed in the benefits of nicotine then they would just chew the gum.
Alcohol is equally bad for you in any form and only retards drink it. It is literally a substance that gives you a buzz from killing you. It's not merely mind-altering, it is mind killing, and is responsible for an untold number of fights, deadly car crashes, spousal abuse and other stupid shit on a daily basis.
You can get THC from gummies, brownies, etc - there is no need to smoke weed. There are numerous people, some with medical conditions, who are very very content just having their THC and CBD, without smoking or vaping anything. The idea that "you can't quit weed, you're addicted" is mostly a faggoty cope/projection from drinkers and smokers who quite literally drink and smoke multiple times per day, with or without other people, and frequently lie and feel shame about their use.
The people most against legalizing weed are cigarette and alcohol addicts, because it exposes them for the retards they are. Once you take away the legal stigma of smoking weed, then much like prescription/OTC medication (think: cough syrup), the benefits FAR outweigh the risks.