Water helps.
Sugar/food helps.

Try to get yourself nutritionally on-track otherwise and you'll probably experience a better high. Eat enough healthy fats (hemp seed has lots of these!) and proteins. Take a good multivitamin and mineral supplement.

Calcium, magnesium, and potassium can help - you can find these in Gatorade or Smart Water, or get them as supplements.

If you weren't taking antidepressants I would advise 5-HTP or St John's Wort (5-HTP you can pop at the same time you smoke but St John's Wort takes at least three weeks to work fully) as they boost serotonin (5-hydroxytryptophan = 5-HTP so this supplement is allegedly identical to the serotonin in your brain). However, in your specific case I wouldn't advise this in addition to your antidepressants.

However, you could ask your doctor about switching to these natural supplements, if you so desired.