Secondhand smoke primes nicotine receptors in brain Exposure to secondhand smoke primes receptors in the brain to 'crave' a nicotine hit, making it harder for smokers to quit, research has shown. by Stephen Robinson Sign in to continue Sign In Email address Password Stay signed in Trouble signing in? Reset password: Click here Need help? Email us Register FREE Limited free articles a month Free email bulletins Register Now Register Now Take a 30-day trial Join MIMS now and pay nothing for the first 30 days Join GPOnline now and pay nothing for the first 30 days Sign Up Sign Up