Most places won't allow you to use homemade smoke. Case in point, one dopey player at Panther lit one a few years back and it caused a fire. The dried leaves, players and staff at the field were rather unhappy.
The best thing out there are the time expired orange marine distress smoke cans. They're a little larger than a tactical smoke grenade, but they burn well, long, and give off a ton of smoke. Best of all they're cheap. You just have to know where to look.
"Anyone with a name like Amanishourbariki should give a few letters to the poor Ng family." - Snarfangel, Fark.com