1.   A drug that is injected reaches the brain faster than if it is smoked or sniffed.

2.   The vaccine teaches the immune system to attack nicotine by producing antibodies that neutralise the addictive chemicals before they reach the brain.

3.   The sensation only occurs when the nerve impulse reaches the brain.

4.   An addict gets high by taking the drug in a way that rapidly increases the dose reaching the brain.

5.   Andrews said antibodies were large proteins that are normally too big to cross a barrier of tiny blood vessels and membranes that keep such things from reaching the brain.

6.   Best, of course, would be to stop nicotine from reaching the brain at all.

7.   He studied neurons that should have responded to touch on the arm but could not because no information from the arm could reach the brain.

8.   However, it is unclear how signals to change direction manage to reach the brain so quickly.

9.   Since it is a presidential campaign year, I should have had in place my moron filter, so rhetoric is stopped before it reaches my brain.