Strong light and even reflection can make the QR code unrecognizable. Due to the air environment, the camera is easy to be contaminated with thick dust, which will also cause the camera to be unable to take a clear image. Just clean the camera.
Overview of cigarettes
A cigarette is a tobacco product. The production method is to dry tobacco and shred it, and then grow it into a barrel-shaped strip with a diameter of 120mm in a paper roll. When smoking, one end is lit, and then at the other end, the smoke generated by duh is sucked out through the mouth. Cigarettes were first popular in Turkey, and locals like to roll up tobacco with newspapers and smoke it.
During the Crimean War, British soldiers learned the method of smoking from the soldiers of the Ottoman Empire at that time, and then spread it to different places. Tobacco is not the only ingredient in most cigarettes.
Sailors brought tobacco seeds back to Portugal in 1558, and then they spread all over Europe. 16 12 years, British colonial official John Rolfe planted tobacco in Jamestown, Virginia, and started the tobacco trade. Tobacco was introduced to China in the middle of16th century. At first, dry tobacco was introduced, which has been planted for more than 400 years.