As mentioned above, nicotine from combustible cigarettes hits the brain in around 7-10 seconds, peak level in the blood (Tmax) is reached within roughly 35 minutes after you start smoking
"I have nothing against people who smoke, I just want to be able to be in my room without feeling like I'm dying
Brain Research Reviews, 18: 247291
And if you can make them shelf stable and cheap enough, then they become accessible to pretty much anybody and start to displace traditional diets
Pulmonary toxicity of e-cigarettes
Capitol The FBI, working in partnership with the United States Attorneys Office for the District of Columbia and law enforcement partners across the nation, remains committed to identifying, investigating, and prosecuting those responsible for the attack