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The acceleration voltage was 5.0 kV, the working distance was about 8.556 mm, the magnification was adjusted to 400 times to observe the morphology of each sample, and the scanning speed was set to slow

Nicotine, one of the main addictive substances in tobacco, causes vasoconstriction, which is the narrowing of blood vessels

Further work is needed to determine whether stopping cannabis use reverses the changes, and whether similar effects are seen in occasional users, say the scientists.

It may end up being a collectible.

Not all counties were predicted to benefit equally from smoking elimination, and cancer rates would fall less than 10% in some counties