Earlier quoted context omitted.
Do you say this to all addicts? There are countless reasons people make bad choices: peer pressure, to calm anxiety, dealing with depression, and yeah, sometimes, abusive parents. But you are refusing them their status of victim of circumstance and saying "well, sucks to be you", and taking the high ground. Good for you, it must be great up there never having made a bad choice. The moment somebody makes a poor choice…
Adults are responsible for themselves, and smoking is absolutely a choice regardless addiction status. If you can't control yourself and be responsible, you shouldn't be in the military let alone manning a submarine.
If the bar for joining the military or manning a submarine is that you had never made a poor choice in your adult life, it would be impossible to recruit. All humans make poor choices, and for all sorts of reasons. Smoking is just one example that many people - yourself included - seem quick to condemn without understanding.