Posted: 30/07/2014 at 07:08
Tomato leaves rolling upwards like cigars can also be caused by envronmental stresses - especially hot weather http://www.clemson.edu/extension/hgic/hot_topics/2008/05tomato_leaf_roll.html
Some of mine have done this a bit during the recent hot daytime temperatures, but they unroll the leaves in the cooler evening air. Rolling the leaves up helps reduce transpiration and loss of moisture from the leaves.
I'm growing an assortment of varieties of tomatoes this year, some heirloom and some more modern types. The leaf-rolling seems to be affecting the more modern types - I shall take closer note. It's also only affecting tomatoes standing on the terrace, where the temperatures are higher, and not the ones in other parts of the garden - although in other respects their conditions are the same.