What is wrong with my cigars?

My 5 Vagas and filipes are not staying lit. They draw good but unless I continually puff on them they produce little smoke and eventually after a great deal of huffing and puffing they get hot and bitter and not worth smoking. They came from CI but have been in my hum for @ 4 weeks. 65-70%Smoked a Perdomo lot 23 last nite and had no problems, bought it from a local shop. Please help