You shouldn't have to have these heart issues at 25. They, in all likelihood, didn't come on out of nowhere. You probably weren't aware you were having them. That's where the importance of a Holter monitor comes in. That way you and your Dr both know exactly what is going on with your heart over an extended period of time. I know you like to smoke weed, smokers like to smoke, alcoholics like to drink, but the reality is,... your reality is... that YOU can't smoke weed and have a healthy, functioning heart. Medhelp is a good place to learn a lot about your health issues. You've made a good start by giving up the cigarettes, alcohol and pot. An ablation is not a piece of cake. Its a very serious procedure, not something you can take lightly. Do you have really, really good insurance? Is the weed really worth losing your health over? A grown-up answer would be "NO." So please think about it and learn all you can about your situation. Its your life, and you only have one. Hopefully a long one. Good Luck! Stay in touch.
If I were you I'd put the marijuana and tobacco behind me. Your heart health trumps everything else.