I got a pack of blank cartos and a 901 to 808 adapter so I could try these for the first time. I am using a mod at 5v if that is important. To me the draw seems so easy that it is luck sucking air thru a straw. I was wondering if I am doing something wrong. The only way I can get a good TH and vapor is to do a direct lung hit for about five to six seconds. Any help or advice is welcome.