Re: How often and what effects??
is it bad for you? definitely. So is riding a motorcycle but i still do both ^_^
But i haven't noticed any decrease in my brass playing or physical dexterity and i smoke generally 3-4 times a day... But i also get the phlegm in the back of my throat, that's just because the membranes in your throat are putting it there to attempt to rid toxins from your body, hence hacking and spitting it up.
If you smoke often, try to also exercise often to give a good balance to your life.