Brief Answer:
Multiple problems affecting erection in your case

Detailed Answer:
Hello,
Thanks for your query.
I appreciate your efforts for medical consultation in so much distress.

Important aspects of your query are:
•     24 year old male
•     Known case of ED and Premature ejaculation
•     Complaints of: Tight foreskin and Smoking.

Erectile dysfunction can be a result of a psychological or physical problem.

Psychological causes: Most common cause in young patients. These include performance anxiety, emotional weakness, inferiority complex, stress, depression, feelings of guilt, and the effects of a past sexual and emotional trauma. Men with psychological problem usually have normal nocturnal/Masturbation erections and erections upon awakening, whereas men with physical problem often do not.

Physical causes: Include neurological disorders, alcoholism, drug abuse, hormonal imbalances, diabetes, hypertension, blood vessel disease, tight foreskin and chronic diseases.

What I can understand from your query is that you are not able to sustain hard erection which is required for intercourse.

You have multiple problems which need attention to improve erection. Below steps will help you in treatment:
-Smoking addiction: quitting it needed for good erection.
-Anxiety and depression: Need treatment if symptoms are still persisting.
-Tight foreskin: Consult plastic surgeon atleast once. Pain reflex due to tight foreskin cause erection problem in many cases.
-Eat a healthy diet: fruits, milk and eggs
-Have faith in yourself and do not take any stress.
-Exercise, particularly aerobic exercise (like: Jogging, skipping and cycling) daily. It will increase blood flow all over body and will reduce stress.
-The commonly prescribed drug by the doctors is sildenafil (Viagra), which causes erections to be stronger and long lasting, but should be taken after prescription. It should not be taken by yourself or in higher dose. It is important to rule out medical conditions specially related to cardiovascular system before starting such treatment.

There is also need to rule out certain medical conditions which can affect erection. These include diabetes, high blood pressure, heart or thyroid conditions, poor circulation, penile venous incompetency and neurological causes. For that comprehensive evaluation and tests, help of other specialist may also needed.

Apart from that in person evaluation and examination by psychiatrist may be necessary in your case to identify and treat psychological cause of ED, specially residual anxiety and depression symptoms and smoking addiction.

As you are in XXXXXXX NCR, you can visit me personally also after taking my address from healthcaremagic in Confidence Clinic.

I hope this information has been both informative and helpful for you. In case of any doubt, I will be available for follow ups.
Wish you good health.
Regards,

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