For Triin:
Congratulations on influencing your mother and starting to influence your friends. The best chance everyone here has of influencing others is just by setting the example you are setting, not smoking and smiling every now and then. You are showing people that there is life after smoking.
They will often seek you out when the time comes that they are ready to try. Then you can teach more specific lessons. The main one is help every smoker wanting to quit understand the nicotine addiction. They need to know that they are not fighting a pack, or a carton, or a million cigarettes--they are fighting a puff! This concept more than any other is going to be the make or break point for any ex-smoker.
If they have computer access get them here to read the quitting material and especially the relapse material. If not print out what you can and share it with them. Don't assume they know what is now common sense to you, there is a tremendous amount of misunderstanding of the nicotine addiction. Make sure that all ex-smokers, whether they be off decades or days understand the simple premise that to stay smoke free they must never take another puff!
Joel