Welcome

There is a lot of stuff out there and likewise a lot of information in here but also a lot of helpful people who are happy to point you in the right direction. With regards to your issue with the cracking, was this one of the ones with a plastic tank section? Some flavour types are quite well known for causing the plastics to crack, there are quite a few particularly strong citrus flavours like lime and also things like cinnamon (i can't think of them all to hand). It seems like this is likely to be the problem you had, I would generally recommend looking at glass options to avoid the issue.