ive had a Vapir 1 for 3 weeks now and have had that occasional coughing problem too. When i searched it, i ended up here. From day 1 to just a few minutes ago. All i can recommend is smaller hits. Depending on the quality, the potent stuff really requires easy toking. The cough isn't harsh, but takes some time to resolve, so it cant be too healthy. Just take it easy!