Jack Diesel Jack Diesel crosses two top weed strains in the cannabis world, Jack Herer and NYC Diesel, to bring out a pungent mix of floral and diesel aromas. Its woody flavors are intertwined with sweet hints of fruit that bring on potent, long-lasting sativa effects. The uplifting sativa buzz is reminiscent of Haze varieties, producing an immediate relaxation followed by an energetic rush that stimulates creativity with appetite Aroma and Effects of Jack Diesel From its origins, this is a strain that has a very special aroma. Sandalwood, cedar and eucalyptus mixed with tangerines anis and of course, Diesel. Its effect is very sedating.