OH IT IS POSSIBLE, but you'll never be able to destroy all the weapons. To stop war you would have to kill every human on earth. And as said in Lord Of War, "your AK-47 is the real weapon of mass destruction. Those nuclear missles, they sit in their silos."

People nor countries will ever let themselves be totally unarmed. That would leave everything open to evil people who want nothing more than to be the biggest and baddest mother fucker around. And advancements are made EVERY DAY in medicine. Look up the average life span these days. Its pushin 80. Back in the days when there werent guns, the average life span was something like 40.

Countries dont just have massive amounts of guns laying around and say to themselves, Ya know what we need, we need a war to put these guns to use.

No, people think of something they want, then get the weapons that they think necessary to take what they want. Then the country who is getting attacked has to get the weapons they feel appropriate to defend themselves with. Its an unstoppable cycle.