It is advised that you do not consume large amounts of alcohol whilst having treatment. Not only is it not good for health generally, chemotherapy can put your liver under strain. Any excessive use of alcohol will contribute to this. Then again, a small drink every now and then will do you no harm.
As you know smoking is not good for your health so we wouldn’t recommend this.
It is also advised not to strenuously exercise whilst having treatment for your molar pregnancy but if you are feeling well enough there is no reason why you shouldn’t. Please bare in mind leisure centres and gym’s are a breeding ground for germs, so you may be more at risk of catching a cold as Chemotherapy can lower your immune system.