Aerosol-generating substrate comprising

1 . An aerosol-generating article comprising an aerosol-generating substrate, the aerosol-generating substrate formed of a homogenised rosemary material comprising between 1 percent by weight and 25 percent by weight rosemary particles, between 5 percent and 30 percent by weight of an aerosol former, between 1 percent by weight and 10 percent by weight of binder, and between 2 percent by weight and 15 percent by weight of exogenous fibres, on a dry weight basis, wherein the homogenised rosemary material is in the form of cast leaf.

2 . The aerosol-generating article according to claim 1 , wherein the aerosol-generating substrate comprises:

at least 50 micrograms of betulinic acid per gram of the substrate, on a dry weight basis,

at least 20 micrograms of rosmaridiphenol per gram of the substrate, on a dry weight basis, and

at least 0.3 micrograms of 12-O-methylcarnosol per gram of the substrate, on a dry weight basis.

3 . The aerosol-generating article according to claim 2 , wherein an amount of betulinic acid per gram of the substrate is at least 5 times an amount of rosmaridiphenol per gram of the substrate.

4 . The aerosol-generating article according to claim 1 , wherein the aerosol-generating substrate comprises greater than 0.5 percent by weight of 1,8-cineole.

5 . The aerosol-generating article according to claim 1 , wherein upon heating of the aerosol-generating substrate according to Test Method A, an aerosol is generated comprising:

at least 30 micrograms of betulinic acid per gram of the substrate, on a dry weight basis,

at least 1 microgram of rosmaridiphenol per gram of the substrate, on a dry weight basis, and

at least 1 microgram of 12-O-methylcarnosol per gram of the substrate, on a dry weight basis.

6 . The aerosol-generating article according to claim 5 , wherein an amount of betulinic acid per gram of the substrate is at least 5 times an amount of rosmaridiphenol per gram of the substrate.

7 . The aerosol-generating article according to claim 1 , wherein the homogenised rosemary material further comprises at least 40 percent by weight of tobacco particles, on a dry weight basis.

8 . The aerosol-generating article according to claim 7 , wherein the homogenised rosemary material comprises between 5 percent and 20 percent by weight of rosemary particles and between 55 percent and 70 percent by weight of tobacco particles, on a dry weight basis.

9 . The aerosol-generating article according to claim 1 ,

wherein the aerosol-generating substrate comprises one or more sheets of the homogenised rosemary material, and

wherein the one or more sheets of homogenised rosemary material each individually comprise one or more of:

a thickness of between 100 μm and 600 μm, or

a grammage of between about 100 g/m 2 and about 300 g/m 2 .

10 . The aerosol-generating article according to claim 1 ,

wherein upon heating of the aerosol-generating substrate according to Test Method A, the aerosol generated from the aerosol-generating substrate comprises:

betulinic acid in an amount of at least 0.5 micrograms per puff of aerosol,

rosmaridiphenol in an amount of at least 0.01 microgram per puff of aerosol, and

12-O-methylcarnosol in an amount of at least 0.01 micrograms per puff of aerosol, and

wherein a puff of aerosol has a volume of 55 millilitres as generated by a smoking machine.

11 . An aerosol-generating system, comprising:

an aerosol-generating device comprising a heating element; and

an aerosol-generating article according to claim 1 .