You can apply the same ideas to drugs and alcohol, and he actually goes over that near the end of the book. I have still found myself snorting the odd line of coke when it has been laid out, but I haven’t bought any drugs since reading the book. I can’t really handle them now anyway. Last weekend I actually refused, which is a first in ages.
The book will help you to build the massive mental fortifications needed to realise that the abyss tobacco and other drugs create are shit and do you no good. Give it a go even if you’re not smoking currently.