Personally I don't drink or smoke because I don't want to inhibited by anything. I don't even like medicines like Advil for example for headaches as usually there are natural ways to take care of it like napping or drinking water or something. With that being said I personally don't think it's a sin to smoke weed if done properly but I could see it being wrong to abuse it and dull your senses and allow it consume you. I.e. if you are smoking every day for the majority of the day and it is stopping you from the things you should be doing normally then that is a problem. I also think the "you can't get addicted" is wrong just because I know or have known people that can hardly function without it. Chemical addiction probably not but mental addiction most definitely