Not the right sub to ask this but all other subs ie fitness/gym wouldn't have published this post.

I go to the gym almost 5-6 times a week and want to gain alot of muscle and put on weight. During my job I end up smoking around 2-3 cigs daily,otherwise I dont really smoke.

How bad is it, and should I stop? I am 18 and may end up trying some drugs, and smoke for fun. Ciggarettes make even the most boring times slightly fun.